But it's not just the heat that's a problem for many people these days; the high UV radiation is also putting a strain on the skin. Ajuma has developed a 'UV Bodyguard' that warns of excessive UV radiation. A small sensor detects UV radiation and transmits the readings to a phone via Bluetooth. Users enter their skin type and current sunscreen in the app and are warned in a timely manner as soon as UV exposure becomes too high. (Photo: TVNOW / Stefan Gregorowius)