That’s a hard question! There are lots of possible answers here – the wheel, the printing press, the internet – I’m not really sure.
I’m quite tempted to go for sanitation. Sanitation basically means having safe ways to handle human waste – urine and poo. Using sanitation effectively saves lives – it prevents the spread of numerous diseases including cholera, dysentery and typhoid. Sanitation is the reason that these diseases are almost unheard of in the UK today.
Unfortunately poor sanitation still affects lots of people across the world, even though we know how to improve it now. According to the Bill and Melinda Gates foundation, “poor sanitation contributes to about 700,000 child deaths from diarrhea each year”, which is pretty horrifying when we know how to fix it.
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