In a typical battery, charged ions zip one way through a sea of other particles as the battery recharges, before racing back in the other direction to release the stored energy on cue.
Today's news: 309 people have died in attacks by Myanmar's coup junta on civilians since the beginning of the resistance counter-offensive; Widodo's government intends to return almost 1,500 Rohingya to Myanmar. In Russia; Prigožin's son takes over 'family' businesses; North Korea closed its embassies in Bangladesh and the Democratic Republic of Congo