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Interesting Engineering

An experiment is casting doubt on the history of stone tools

Olduvai stone chopping tool, made from basalt, from Olduvai Gorge, Tanzania, 1.8-2 million years old. British Museum (1934,1214.1). BabelStone / Wikimedia. Electronics, airplanes, internal combustion engines, and the wheel are the descendants of a far more rudimentary technology: stone tools. Early stone tools might seem simple, but their invention represents a massive milestone in the history of our species.
SCIENCE
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Good news, universe! Scientists are one step closer to finally understanding dark matter

About 85 percent of our universe is believed to be composed of dark matter, a hypothetical material that does not interact with light. So it neither reflects nor emits nor absorbs any light rays, and therefore, we can not see this unusual form of the matter directly. However, to understand and explain the nature of dark matter, scientists have created various models.
ASTRONOMY
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Could we ever make self-healing cars?

The ability to self-repair damage is a fundamental property of organic life. But, for nonliving matter, like metals or rocks, any damage made to them is for keeps. For things made from nonliving stuff, like cars, this is one of the occupational hazards of vehicle ownership. Repairs and replacement parts are constantly needed over time, adding to the cost of ownership over the vehicle's lifetime.
CARS