If you were to guess, what do you think ancient humans used as contraceptives? It's definitely hard to list even a couple of ideas given how far we've come since the start of the 20th century. 

According to historians, the first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Dried dung was inserted into the vagina to form an impenetrable barrier. Other pessaries used back in the day included tree sap, lemon halves, cotton, wool, sea sponges, and elephant dung.

Later on, however, condoms made of animal bladders or intestines were also reportedly used. Luckily, in 1844, Charles Goodyear obtained the first patent for a rubber condom. ...

There's no question that many parents today still, to some extent, hesitate to vaccinate their babies due to fears that it's linked to autism. Of course, this idea all started after a 1998 study published in The Lancet showed a link between sudden behavioral changes in 12 children shortly after a vaccine was administered (article linked below). Although the study has been retracted due to technical flaws, such as the small sample size used by the researchers to make their conclusions, parents to this day still reference the article to justify why they shouldn't vaccinate their children.

Most misinformation on vaccines comes from the lack of education on how they're developed, what they contain, and how they work. Personally I don't blame par ...