By Donna Lu
Time for sunscreen?
Our skin needs to get a certain amount of ultraviolet light to produce vitamin D, but how do we know when we have had too much sun? Wearables that change colour when exposed to UV light could tell us when we should put on sunscreen or seek shade.
Ali Yetisen at the Technical University of Munich in Germany and his colleagues created the wearables using liquid dyes that are sensitive to two types of UV radiation.
They used several different dyes that change colour when exposed to UVA and UVB; colour transitions included from yellow ...
Users from all around the world go live, publish interesting photos and videos from trips, leave feedback and share their feelings and impressions. Watch live broadcasts of fellow travellers. Comment, ask, and learn new things. Communicate with the authors of the broadcasts in real time.