The evolutionary community has been buzzing over bacteria's new ability to obtain citrate, a carbon-containing chemical, from their environment and use it as a food source. Some say this confirms evolution in action, but what if the bacteria were designed to modify themselves? That might disappoint evolution enthusiasts.

Viruses were originally created for a good purpose, but some cause disease in today's fallen world.¹ Good or bad, viruses are well-designed molecular machines.² And like all machines, they need certain traits to fulfill their functions.

How would a vehicle slow or stop on time or on target without some mechanism to disengage the engine from the drive train?

Researchers discovered eight well-manufactured throwing spears in an Ice Age coal deposit near Schöningen, Germany. They are calling these the oldest human tools. What can forensic science reveal about the people who made them?