India, Feb. 17 -- A government scientist in Norway built a machine capable of emitting powerful pulses of microwave energy to prove that such devices are harmless to humans, and eventually ended up developing symptoms similar to 'Havana syndrome'.

'Havana syndrome' is an unexplained malady which has struck hundreds of spies and intelligence officials around the world.

Those suffering from the syndrome experience long-lasting effects including cognitive challenges, dizziness and nausea, which the US government refers to as Anomalous Health Incidents (AHIs), the Washington Post reported. Havana syndrome was named so because of the mysterious outbreak of the above symptoms reported by personnel at the US Embassy in Havana in 2016.

The sec...