We have enough evidence that at the time of Mahabharata – which happened three thousand years before Jesus Christ – something like nuclear weapons were used. So it is not that science had not developed – but it was prevented; its direction was changed.
Seeing its destructiveness, seeing that it is against ecology, seeing that sooner of later it would destroy humanity itself … all scientific movement was directed into other dimensions. For example, yoga, tantra, ayurveda – these are all scientific methods, but not against nature, not against man; they are creative.