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PT Barnum posted This Way to the Egress in his museum’s

PT Barnum, frustrated with how long people lingered in his museum’s exhibits, posted large signs throughout that said “This Way to the Egress”. He knew most of the visitors would follow them, not knowing that “Egress” meant “exit”. They couldn’t re-enter without paying the entry fee again. The museum’s collection included items collected throughout the […]

battery

The worldwide battery industry generates US$48 billion

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy. Each cell contains a positive terminal, or cathode, and a negative terminal, or anode. Electrolytes allow ions to move between the electrodes and terminals, which allows current to flow out of the battery to […]