/u/19olo's posts in /r/askscience

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Could humans have populated the earth with only two people?

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Hiv can only be transmitted via sexual activities and blood-fusing (mainly through needles), it feels like it's not really easy for hiv to spread from people to people, yet in 2018 1.7 million people tested hiv-positive, is this a lot? If yes, then why?

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What the composition difference of body shampoo and hair shampoo? Can one be used to substitute one another?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Could humans have populated the earth with only two people?	1
Hiv can only be transmitted via sexual activities and blood-fusing (mainly through needles), it feels like it's not really easy for hiv to spread from people to people, yet in 2018 1.7 million people tested hiv-positive, is this a lot? If yes, then why?	1
What the composition difference of body shampoo and hair shampoo? Can one be used to substitute one another?	1