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Mengapa petir berbentuk zigzag?

Petir tidak berjalan dalam garis lurus, dengan banyak yang disebut ‘pemimpin’ turun dari awan dalam serangkaian langkah bergerigi. Sampai sekarang, belum ada yang tahu mengapa.
You’d probably get a bit of a fright if ball lightning started moving through your house. Wikimedia Commons

Ball lightning exists … but what on Earth is it?

Ball lightning is one of the strangest phenomena on our planet. It’s usually seen during thunderstorms as a ball of light about the size of a grapefruit, with the intensity of roughly a 40W light bulb…

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