The rise and fall of an online epidemic: How studying the spread of infectious diseases suggests the global drinking craze Neknomination will fizzle out. Drinkers post videos of their exploits and nominate others to do the same – but eventually the fad will run out of steam says epidemiologist Adam Kucharski from the London School of Hygiene and Tropical Medicine. Plus, while politicians debate how much to tax the rich in France and the UK– we look at which countries levy the highest and the lowest rates of income tax for both the wealthy and average worker.