Ventless heat-pump dryers dry clothes more efficiently at cooler temperatures

It may seem like the last place in your house you'd look for cutting-edge technology, but the laundry room is a pretty cool spot these days. No, seriously.

An exciting innovation that's reached our shores in recent years is the ventless heat-pump clothes dryer. They've been available since the 1990s in Europe, where the higher cost of electricity is a major incentive toward using less of it, but are just now developing a presence here.

With a long list of ecological and economic benefits, green roofs are picking up in popularity

Imagine looking down on an urban centre from above and seeing nothing but verdant green. Stark rooftops are now overgrown with grasses, shrubs and trees. Here and there, sunlight glints off small ponds. The outlines of streets and roads are just visible through the greenery.

This may sound like a vision of a post-apocalyptic future in which nature is reclaiming abandoned cities. But in fact, it's a modern technology that proponents of green roofing would love to see become a widespread reality. The sooner the better.