@Heiwa
You saying your friend helped Stalin makes you sound like a fraud. To prove this, we require your friend's name(as he'd be famous), your selfie (which we shall verify with you doing a specific thing), and a picture of both of you in a picture together.
You said one word correctly in French. Impressive. Ce n'est pas quelque chose qu'un enfant peut faire...do more, s'il te plait.
Go to Hiroshima and Nagasaki and measure the radiation levels there. Go to Project Trinity's test site. Look at the sand that has been heated into glass in that blast radius.
Or, if you're so certain they don't work, and you're rich enough to have €1m, buy some nuke-grade uranium from a few sources ex: Reykjavik, Dark Net, etc. I'll tell your so-enlightened self how to build the device, although you'll need around €2m.