I have been writing about some world’s oldest stuff for last few days. I think the most interesting one is going to be the one that I am going to talk about today. Condoms are very important! We think of this as a relative new invention but the oldest condom dates back to 1640! The surprising thing is that this condom is still usable! The user manual is written in Latin. This condom was found in Sweden and it is made out of pig intestine!