Overhead projectors are useful tools to present large visuals in the classroom or boardroom, but poor care and the temperature of the machine cause possible risks to your health and safety. To ensure ...

Projectors have come a long way over the past 20 or 30 years. After spending the first decade of my teaching career using overhead projectors, I do not miss having my fingers covered in red, green, ...

Ernie Smith is a former contributor to BizTech, an old-school blogger who specializes in side projects, and a tech history nut who researches vintage operating systems for fun. Years ago, projectors ...