How – and why – we chose the best 21 ideas of the 21st century
What separates a good idea from a bad one? It isn’t always easy to tell. Take the invention of vaccination, for example. Drawing pus from a woman infected with cowpox and injecting it into an 8-year-old boy seems utterly reckless, but in doing so, 18th-century physician Edward Jenner found a way to fight the deadly…
