Most spiders have eight eyes. Some species have less, but they always have an even number! Despite having so many eyes, the majority of spiders still can’t see very well and rely on their sense of touch and smell to navigate around their environment. Spider Facts Insects have large compound eyes ( with multiple lenses…
Have you ever wondered why the clocks go back? It’s always nice to get a lie in when the clocks turn backwards, but not so good when they go the other way. Daylight Saving Time was first used in the UK in 1916. It basically borrows an hour of light from the morning and moves…
To answer this question, you first need to understand how sound travels on Earth. In very basic terms, sound travels from the source of the sound to our ears by vibrating air molecules. Sound waves need a medium to travel through. Space is a mostly empty vacuum, so there’s no medium for sounds to travel…
The pH scale measures how acidic or alkaline a solution is. It ranges between 0 and 14. Acids have a pH of less than 7. Alkalis ( or bases ) have a pH of over 7. pH 7 is neutral. How is pH measured? pH is measured using an indicator. An indicator is a dye…
Hot air balloons work thanks to convection currents. The heat source under the balloon heats the air inside. A convection current inside the balloon keeps the air warm as heated air continually rises, cools and falls to be heated again. The warm air inside the balloon is less dense than the cooler air on the…
Brownian Motion is the random movement of particles suspended in a liquid or gas. The movement is caused by particles colliding with each other. Brownian Motion is named after a botanist, Robert Brown, who noticed pollen grains moving around randomly in water under a microscope. Even though pollen grains are much larger than water molecules,…
image of the Sun, Earth and Moon
Freezing point depression occurs when a substance lowers the freezing point of another substance. One example is adding salt to water. A solution of salt and water has a lower freezing point than water alone. Melting and freezing: a recap Melting is when a solid turns into a liquid. The temperature at which a solid…
A magnet is an object that produces an invisible magnetic field. A magnetic field is an area where magnetic materials experience a force. Objects attracted to a magnet are either a magnet themselves or are made from a magnetic material. The magnetic force in a magnet flows from the north to the south pole, which…
The Coriolis Effect refers to how the objects moving on the surface of the Earth appear to follow a curved path due to the rotation of the Earth. It is named after Gaspard Gustave de Coriolis who first described the effect. The Coriolis Effect influences the movement of wind. Wind is moving air caused by…
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