Last night Google released Presentations, the latest in its suite of online applications, and a potential competitor to Microsoft's massively popular PowerPoint. All you need is a Google Docs account to access the free tool, an easy-to-use, scaled-down version of Microsoft's mainstay. Not all the reviews have been glowing. At this point there's really no competition. Powerpoint has far more features, and it's already more than a simple business presentation tool—it's a medium for artistic expression, and nearly a cultural force. But every champion needs a good challenger now and then.—Gregory Mone
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.