As for using energy as a weapon, this week's Ukrainian affair is a reminder of an old lesson: that sellers depend on buyers just as much as buyers on sellers.

ECONOMIST: Energy security

It weighed about 10 tonnes when it entered the Earth's atmosphere and broke apart 30-50km (20-30 miles) above ground, according to Russia's Academy of Sciences, releasing several kilotons of energy - the equivalent of a small atomic weapon.

BBC: Russia sends clean-up team to meteorite-hit Urals

His manifest brilliance and energy remain, along with the bravodo, but these days, the weapon he wields with visitors is likely to be self-deprecatory humor, not intimidation.

FORBES: Larry Ellison