There are many / a lot of / lots of / plenty of important innovations(paljon tärkeitä innovaatioita) in the history of technology.

The printing press, electricity and penicillin are only a few / only some of them(vain muutama niistä).

Sanitation systems had very much(hyvin paljon) to do with people’s life expectancy increasing by 40 years.

Few people(Harvat ihmiset) would deny the importance of the aeroplane.

In the 18th century, people were a little / somewhat / a bit sceptical(vähän epäileväisiä) about the fact that making someone sick on purpose would be a good thing.

The arguments against vaccination in the 21st century are very much the same(hyvin paljon samanlaisia) as they were in the 19th century.

Most scientists(Useimmat tiedemiehet) would agree that the steam engine was the most significant force in the Industrial Revolution.

The 1970s brought us personal computers. Little did we realise / realize / understand(Vähänpä tajusimme) then how important a part of our everyday lives they would become within/in a few / some decades(muutamassa vuosikymmenessä).