Question: things that are ahead of their time?
Answer: Contact lenses – 1632. YouTube. ... , Solar cells – 1883. ... , Vending machine – some time in the first century. ... , Military mind control – right now! ... , Mercedes Biome – right now! ... , Difference engine – 1822. ... , Electric car – 1828. ... , Flushing toilets – 18th century BC.