What would happen to the population if scientists cured all diseases?

humans breed to excess. When a nation gets wealthy enough and has access to birth control the population declines or stabilises. 3rd world populations have expoded in the last 100 yrs due to colonisers giving them antibiotics and vaccines and stopping them fighting - this leads to genocides once the colonisers leave/ get thrown out (eg Rwanda) and famines (rest of africa). AIDS is killing off a lot of Africans. U are bascailly right - we'll have to find a way to limit growth. The CHinese do it by saying 'only one child' but this leads to a lot of female infanticide. Also in India. Probably a pandemic - eg bird flu - will do the job for us.