Winning the confidence of mayors all over his country, Yu’s design firm, Turenscape, has completed hundreds of infrastructure projects called “Sponge Cities” since its founding in 1998.

The shame. Boot polish formulations have moved on from a puck-like tin; you can now get them in tubes, sprays and with sponge applicators, meaning no more polish-stained cloths to deal with.

Ever wished you could make that cake recipe just a little bigger or smaller for the tins you have? Or know how much icing to cover a batch of cupcakes? Or how much fondant icing you need to cover ...

To use, simply remove the foil tip and apply to skin using fingers, a brush or sponge. Avoid Contact with eyes. Add more layers (once dry) to increase the effect under UV. After use, simply remove ...