Donald Trump marked his 80th birthday by hailing an initial agreement to end the Iran war and staging a cage-fighting show on the White House South Lawn.
How did the light-emitting diode change the world? And, come to mention it, might it perversely actually prompt us to puff more carbon dioxide into the atmosphere?
Police in Geneva have fired tear gas and water cannons at protesters who set fire to a Tesla vehicle and smashed windows at a UN agency in protests ahead of Monday's G7 summit in neighbouring France.