Matthias Broda, inventor and designer of the wooden e-bike, cycles a prototype along a street in Berlin, November 20, 2014. The wooden e-bike produced by German company Aceteam from ash wood, will be launched on the market by spring 2015 and will cost around 3,950 euro (4,950 dollars). The e-bike will be equipped with an 250W e-bike motor for a range of up to 100 kilometer (62 miles) with a rechargeable battery. (Photo by Fabrizio Bensch/Reuters)

A German Air Force Officer sits astride a dead boar outside a house where he is stationed near the Western Front, in this 1918 handout picture. This picture is part of a previously unpublished set of World War One (WWI) images from a private collection. The pictures offer an unusual view of varied and contrasting aspects of the conflict, from high tech artillery to mobile pigeon lofts, and from officers partying in their headquarters to the grim reality of life and death in the trenches. The year 2014 marks the centenary of the start of the war. (Photo by Reuters/Archive of Modern Conflict London)

In this Sunday June 13, 1988 file photo West German police officers arrest an English soccer hooligan who sticks out his tongue. Rioting broke out between some 100 hooligans and the police in downtown Stuttgart, West Germany following the European Soccer Championships match between England and Ireland. England was defeated by Ireland 0-1. (Photo by Kraufmann/AP Photo/File)

Heidi Klum and daughter Leni set pulses racing in red lingerie. The pair star in a new campaign for Italian underwear and accessory firm, Intimissimi. German supermodel Heidi, 49, and Leni, 18, her daughter with Flavio Briatore, previously starred in a campaign for the brand. They pose here in red ahead of Christmas on November 22, 2022. (Photo by Intimissimi/The Mega Agency)

A woman with a large cross decorated with a Jesus figure during the use of water cannons by the police after heterogeneous groups around Corona deniers, conspiracy theorists and right-wing extremists called for blocking access to German Government Buildings in Berlin, Germany on November 18, 2020. Both the Bundestag and the Bundesrat vote on planned new regulations of the infection protection law. (Photo by Jan Scheunert/ZUMA Wire/Rex Features/Shutterstock)

West German police arrest a young man, one of the angry crowd throwing stones at a bus full of Soviet guards making their way to the Soviet War Memorial, 20th August 1962. The crowd were incensed by the death of 18-year-old Peter Fechter, who was shot while trying to cross the Berlin Wall a few days earlier. (Photo by Central Press/Hulton Archive/Getty Images)