Be careful what you poll… A vote on Twitter by Elon Musk has urged him to sell 10% of his stake in Tesla in order to pay tax. The poll was done in response to a "billionaires tax" proposed by US Democrats. The successor to the Hubble Space Telescope is set to launch in six weeks... after more than a decade of delays. Astronaut Wang Yaping has made history by becoming the first Chinese woman to walk in space. The US offers bounty of up to $10m for information on hacking group known as ‘DarkSide’. Has frozen semen from the 1960s repopulated an extinct species of cow? Why SpaceX has had to delay four astronauts’ return to Earth. A mysterious app climbs top of the charts but no one really knows why. And, a nine-foot-tall joystick breaks records.

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