A musher tethers a husky before a training session in Chelford, Britain, December 29, 2020. Picture taken December 29, 2020. REUTERS/Molly Darlington

A musher tethers a husky before a training session in Chelford, Britain, December 29, 2020. Picture taken December 29, 2020. REUTERS/Molly Darlington

Huskies are seen on a tether before a training session in Chelford, Britain, December 29, 2020. Picture taken December 29, 2020. REUTERS/Molly Darlington

A musher tethers a husky before a training session in Chelford, Britain, December 29, 2020. Picture taken December 29, 2020. REUTERS/Molly Darlington

A musher tethers a husky before a training session in Chelford, Britain, December 29, 2020. Picture taken December 29, 2020. REUTERS/Molly Darlington

A husky on a tether eats after a training session in Chelford, Britain, December 29, 2020. Picture taken December 29, 2020. REUTERS/Molly Darlington

A woman tethers a boat using a rope as an art installation called 'Mirror Pavilion' by John Gerrard is seen behind her before it is fully completed in Galway, Ireland, August 28, 2020. Picture taken August 28, 2020. REUTERS/Clodagh Kilcoyne

A sign posted on a residential front door displays a message of "Thank you to all frontline workers" as the spread of coronavirus disease (COVID-19) continues, in Dublin, Ireland, April 4, 2020. REUTERS/Clodagh Kilcoyne

A dog is pictured beside subsoil monitoring equipment installed to track effects of rock salt mining by the petrochemical company Braskem in Maceio, Brazil January 29, 2020. Picture taken January 29, 2020. REUTERS/Amanda Perobelli

Cyclists ride tethered with a rope past graffiti reading "Free political prisoners" in Cadaques, Spain March 1, 2020. REUTERS/Nacho Doce

A dog is seen outside a polling station during Ireland's national election in Dublin, Ireland, February 8, 2020. REUTERS/Phil Noble

A woman and two dogs are seen outside a polling station during Ireland's national election in Dublin, Ireland, February 8, 2020. REUTERS/Phil Noble

A dog walks past anti-Brexit graffiti on a pathway in a park in central London, Britain, February 5, 2020. REUTERS/Toby Melville

Dogs are walked past anti-Brexit graffiti on a pathway in a park in central London, Britain, February 5, 2020. REUTERS/Toby Melville

Dogs are walked in the snow at Bannockburn, Scotland, Britain January 28, 2020. REUTERS/Russell Cheyne

A husky is tethered before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

Huskies are tethered before going on a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

Huskies are tethered before going on a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

Huskies are tethered before going on a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

Huskies are tethered before going on a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

Huskies are tethered before going on a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

Huskies are tethered before going on a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

A husky is tethered before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

A husky is tethered before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

A tethered husky eats meat before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

A husky is tethered before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

A husky is tethered before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

A husky is tethered before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne

A husky is tethered before a training run for this weekend's annual Aviemore Sled Dog Rally, Feshiebridge, Scotland, Britain January 21, 2020. REUTERS/Russell Cheyne TPX IMAGES OF THE DAY

A guardian escorts children on a tether while walking across a road in the Papineau area of Montreal, Quebec, Canada, October 21, 2019. REUTERS/Carlo Allegri

A guardian escorts children on a tether while walking on a sidewalk in the Papineau area of Montreal, Quebec, Canada, October 21, 2019. REUTERS/Carlo Allegri

A man carrying a pet dog walks past stones thrown by anti-government protesters in Hong Kong, China, October 20, 2019. REUTERS/Kim Kyung-Hoon

Nyima, a 17-year-old Tibetan, tethers his family's herd of yaks for the day on a grassland in Madoi county, Golog Tibetan Autonomous Prefecture, Qinghai province, China September 1, 2019. Picture taken September 1, 2019. REUTERS/Ryan Woo

The city of Bell's chief of police Carlos Islas reacts after Wrap Technologies CEO Michael Rothans tests on him a new non-lethal weapon that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject, in Bell Police Department, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

The city of Bell chief of police Carlos Islas reacts after Wrap Technologies CEO Michael Rothans tests on him a new non-lethal weapon that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject, in Bell Police Department, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, is deployed during training in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Bell police officers attend an information and demonstration session of a new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Bell, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Bell police officers attend an information and demonstration session of a new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Bell, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

The barb of a new non-lethal weapon by BolaWrap is seen after discharging an 8 foot bola style Kevlar tether, which fires at 640 feet per second to entangle a subject, during training in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Bell's chief of police Carlos Islas and police officers look over the deployed BolaWrap during a demonstration of a new non-lethal weapon, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Bell Police Department, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, is deployed during a demonstration of the device in Bell Police Department, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Police officers attend a training by Wrap Technologies on the use of the new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Police officers attend a training by Wrap Technologies on the use of the new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A Bell police officer looks over an information sheet during a demonstration session of a new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Bell, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Cartridges for a new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, are shown during a training session in Laguna Niguel, California September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A Bell police officer looks at a barb used in a new BolaWrap non-lethal weapon, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, during a demonstration in Bell Police Department, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, is deployed during training in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Don De Lucca, Chief Strategy Officer of Wrap Technologies, speaks during a demonstration session of a new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in the Bell Police Department, in Bell, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Police officers attend a training by Wrap Technologies on the use of the new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Trainer Michael Harding points a laser-guided new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, during training in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Training officers wear new non-lethal weapons by BolaWrap, that discharge an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, during a training session in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A look inside a BolaWrap demonstration cartridge of a new non-lethal weapon that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Bell, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Michael Rothans, Chief Operating Officer of Wrap Technologies, speaks during a demonstration session of a new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in the Bell Police Department, in Bell, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Training officers wear new non-lethal weapons by BolaWrap, that discharge an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, during a training session in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

Trainer Michael Harding points a laser-guided new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, during training in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, is deployed during training in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A new non-lethal weapon by BolaWrap, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, is deployed during training in Laguna Niguel, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

A trainer from BolaWrap presents a non-lethal weapon, that discharges an 8 foot bola style Kevlar tether at 640 feet per second to entangle a subject at a range of 10-25 feet, in Bell, California, U.S., September 5, 2019. Picture taken September 5, 2019. REUTERS/Mike Blake

During initial tests of their 8.1-metre tall reusable rocket, Chinese engineers from LinkSpace, a start-up led by China's youngest space entrepreneur, used a Kevlar tether to ensure its safe return. Just in case. But when the Beijing-based company's prototype, called NewLine Baby, successfully took off and landed last week for the second time in two months, no tether was needed. The 1.5-tonne rocket hovered 40 metres above the ground before descending back to its concrete launch pad after 30 seconds, to the relief of 26-year-old chief executive Hu Zhenyu and his engineers - one of whom cartwheeled his way to the launch pad in delight. LinkSpace, one of China's 15-plus private rocket manufacturers, sees these short hops as the first steps towards a new business model: sending tiny, inexpensive satellites into orbit at affordable prices. Demand for these so-called nanosatellites - which weigh less than 10 kilogrammes and are in some cases as small as a shoebox - is expected to explode in the next few years. And China's rocket entrepreneurs reckon there is no better place to develop inexpensive launch vehicles than their home country. REUTERS/ SEARCH "SHOEBOX CHINA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. Matching text: SPACE-EXPLORATION/CHINA-STARTUPS

A U.S. Customs and Border Protection Air and Marine Operations aerostat, which is a tethered blimp-type airship deployed to combat illegal activity along the border, is pictured near Penitas, Texas, U.S., April 7, 2019. REUTERS/Loren Elliott