I had return of Biggles event and I choose the second time I got it to watch what he does, my villagers gained 4100 tech points. Then I had the same event again and watched him and this time my villagers gained 6000 tech points

I got the ancient tablet event at the start of my game either research it or display it, I choose to research it and I got a level 3 in alchemy cost 2000 tech points. which was a bargan