Senku and his kingdom of science successfully test the first lightbulb since the collapse. Meanwhile, Asagiri Gen, a spy from Tsukasa’s empire, is killed by an unknown attacker.
What even is electricity, anyway?
ما هي الكهرباء بالضبط على أيّ حال؟
Was soll Elektrizität überhaupt sein?
¿Y qué es la electricidad?
¿Y qué es la electricidad?
C’est quoi, l’électricité, d’abord ?
Ma insomma, si può sapere cos'è 
questa "energia elettrica"?
O que é eletricidade mesmo?
А что вообще такое электричество?