The Evolution of the Thumbs-Up Icon: From Gladiators to Social Media

A groundbreaking space mission will help scientists peer through dense jungle canopy to measure the difference the world's forests are making to climate change. We interview the expert who came up with the idea.

Also on Tech Life: It's clicked billions of times a day, but do you know how it started in the first place ? We find out why the world gave a big thumbs up to the 'like' button. And digitising agriculture in Ghana - how tech is streamlining the growing and selling process for thousands of farmers.

Tell us about the one item of tech that you simply can't do without – please get in touch by emailing techlife@bbc.co.uk or send us a Whatsapp message or voice memo on +44 330 1230 320.

Presenter: Chris Vallance Producer: Tom Quinn Editor: Monica Soriano

(Image: An illustration of the Biomass satellite in space. Credit: ESA/ATG medialab)