Q. I have an older home with a crawlspace foundation. My problem is the floors sag in the living room to the point where it’s hard to keep a lamp steady on the end tables. My other problem is there is ...

In most motorbikes and cars, headlight controls are limited. They have a fixed direction of beam and it can only be switched between high beam and low beam. This makes it difficult to drive when there ...

The prototype radiotherapy system combines a fixed vertical radiation beam with horizontal patient rotation. (Courtesy: Paul Liu) Radiation therapy plays a fundamental role in cancer treatment, but ...