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The wheel

The earliest wheel, the logroller, was used by Neolithic people to transport heavy weights, such as large stones. By 3500 BCE, the logroller was adapted to create the 19.___________(ONE) true wheels — disks of wood connected by an axle. 20.___________(THIS) wheels, however, were very heavy. Lighter wheels were invented around 1600 BC. The more hard-wearing, iron wheels came around 800 years later, suitable for battle and long-distance transportation. Wheels steadily evolved, using materials such as iron and steel as they were developed. Modern wheels, 21.___________(USE) high-tech combinations of titanium or aluminum that are light and allow vehicles to move faster, consume much 22.___________(LITTLE) power.

Mysterious radio signals blast all over the cosmos

Every day, thousands of mysterious radio signals flash across the universe, astronomers have found. 23.___________(DISCOVER) in 2007, these fast radio bursts (FRBs) are extremely bright flashes of radio waves that last just milliseconds and seem to occur across the universe. We still don't know what causes most of them. Until 2018, FRBs 24.___________(BE) notoriously tricky to find because of their short duration. But the Canadian Hydrogen Intensity Mapping Experiment telescope came online that year, and now researchers have announced a new catalogue of many more FRBs. The catalogue allows the team to estimate that there should be 9000 FRBs visible every day in the sky.

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