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There are just 31 GPS satellites currently working and they orbit along different paths to cover Earth’s entire surface. These satellites carry extremely precise clocks, and they’re constantly broadcasting the time. A GPS receiver can measure how long it took for that time signal to arrive from the satellite. If the receiver can listen to 4 satellites at the same time, they can find your exact GPS location!

All of these are famous tech teams competing to create the first cars that can drive without any human assistance. Other famous self-driving car companies include Tesla, General Motors, Ford, Nissan and Mercedes-Benz. It’s quite the race!

Ostriches are the largest living bird and they lay eggs that regularly weigh 1,500 grams – about 30 times a standard chicken egg! The kiwi is much smaller, but it lays eggs that weigh 370 grams. That’s nearly 15% of its body weight! In comparison, the ostrich egg is only 2% of an ostrich’s body weight.

The Aussie Bird Count is a nation-wide citizen science project where Australians can record the birds they spot. For 10 years in a row, the rainbow lorikeet topped the list as the most commonly spotted bird. (Magpies are a close runner-up). Scientists say that the most common birds tend to be bold and have broad diets.

The colour-sensing cells in our eyes are called cones and there are 3 kinds: red-sensing, green-sensing and blue-sensing. Your brain combines information from lots of cones to see the rainbow spectrum. Scientists estimate we can detect up to 10 million different colours!

Ancient Egyptians used lots of ingredients to prepare mummies. First, they dried the body with a salt called natron. Next, they made lotions with animal fats, beeswax and smelly oils to fight bacteria. Finally, they wrapped the mummies in linen and covered them with resin, a sticky substance made by plants.

A strong password uses uppercase letters, lowercase letters, numbers and symbols (like !, @, #, $). It’s also important to use passwords that are different from past ones. Strong passwords are harder to remember so it is a good idea to use a password manager.

The International Space Station normally has a crew of 7, but sometimes it holds more. When the Space Shuttle was operating, the ISS sometimes had up to 13 astronauts inside at the same time.

Blue whales have eyes the size of grapefruit! Though this is very small compared to their overall body size. Owls have big eyes for their size, but a blue whale’s eye is bigger than most owls’ heads!

A seismograph is a scientific instrument that detects the seismic waves created by an earthquake. Seismic waves make the ground wiggle and a seismograph records these movements. The first seismographs were invented in the 1800’s.