EnvironmentCity in Sierra Leone covers buildings in mirrors to fight extreme heat People in Freetown, Sierra Leone, are increasingly exposed to extreme heat due to climate change and the urban heat island effect, but covering homes in a reflective film significantly cut indoor temperatures 51¶¯Âþ
MathematicsHow maths reveals the best time to add milk for hotter tea If you want your cup of tea to stay as hot as possible, should you put milk in immediately, or wait until you are ready to drink it? Katie Steckles does the sums Regulars