Animated map by @neilrkaye shows the temperature range between the coldest and hottest month for each line of latitude around the world. Near the equator there is barely any difference visible. Source: https://t.co/hTv7u9fzA8pic.twitter.com/bOhPFnmjZb
The price of 1 million lumen-hours since the Middle Ages. A lightbulb does that in ~600 hours, or about 2 months of daily usage. So multiply these prices by 6 to see how much it used to cost to use a lamp for one year. So many things we take for granted used to be such luxuries. pic.twitter.com/hEYmqVf6D5