Designs of the Year: chairs that make you fidget and a piano from the future

From the Pro Chair that makes schoolkids squirm to an all-black piano, plus Prada and Zaha Hadid, here are the seven category winners from the Designs of the Year

Makeup mogul Bobbi Brown to take over Yahoo’s beauty section

Founder of Bobbi Brown cosmetics will keep her role at makeup company while fulfilling new role as section editor-in-chief

50m tonnes of e-waste generated every year – and it is increasing

Better links between designers, manufacturers and recyclers are needed to stem the tide of electronic junk

Warhol-style 200 bitcoin print bought by anonymous buyer

The face value of 200 bitcoins may be higher than $200, but the artist isn’t quite Warhol famous – yet

Are medical apps on your smartphone good for your health?

Handheld digital tools that record vital signs are revolutionising healthcare, allowing people to be monitored at home, but also raising concerns

Japanese company named as biggest online retailer of ivory and whale meat

Conservation groups say Rakuten’s website carries 28,000 adverts for elephant ivory and 1,200 for whale products