Double-sided beds are still a rarity, but these mattresses might offer some surprising benefits for sleepers looking to switch things up ... but this is the most common design).

Uber in the transportation industry, Airbnb in housing and Upwork in the gig economy are common examples of two-sided marketplaces bringing industry-wide disruption. Even the arts and crafts ...

Double-sided solar panels that tilt based on the sun’s position could boost the amount of energy collected. The two approaches existed independently before, but researchers have now looked at ...