Mammals have hair, warm blood and feed milk to their young.

There are mammals on land, in water and on air. Bats are mammals because they have hair, warm blood and feed milk to their young. Bats have wings but unlike birds, bats have 5 fingers. 4 fingers developed wings and the other finger is used for holding on to walls.

There are marine mammals too like Dolphins for example. Dolphins are warm blooded and feed milk to their young.

Most mammals live on land like us humans. Mammals blood always have the same temperature whether its cold or hot.

Hair is what keeps us warm during the winter.

Mammals give birth to babies when its fully developed inside them.


Earth has 5 layers of atmosphere, troposphere, stratosphere, mesosphere, thermosphere and the exosphere.

The higher altitude you go the thinner the air gets.

Troposphere is known as the weather layer because weather occur on this layer.

Stratosphere is where the air begins to get cold. The higher altitude you go the colder the air gets. Ozone layer is on the stratosphere. Ozone is a gas that protects us from too much solar radiation.

Mesosphere is the layer where meteors disintegrate from friction.

Thermosphere is the hottest layer of the atmosphere. Charged particles form on the thermosphere called ionosphere.

Exosphere is the thinnest atmosphere there is. The sky is blue because the gases in the exosphere scatter. Light has different wavelength and each wavelength has a color. Blue is the color that gets through the exosphere so thats why the sky is blue.

Food Web and Light

Today I watched Bill Nye about food web and light.

Basically, everything we eat comes from plant.

All food  comes from plants. Meat like cows and pigs eat plants to survive. Humans like you and me eat the meat and gain the nutrients that the meat has.

Food Web is a consumer system. Take an apple tree for example, the tree gets food through photosynthesis. The tree produces apples, the apples are consumed by animals like pigs. The pigs gain nutrients from the apple and we humans eat the pig and gain nutrients.

Plants are called producers because they produce food from the sun. Humans and animals are called consumers because we eat the plants and other animals for nutrients.


Refraction happens when light is bent by a piece of plastic or glass. This happens because light travels through solid things at different speeds. There are a few kinds of lights. Natural light is like the sun or a bonfire. Light can also be produced by chemical reactions like a light bulb and the light of an angler fish. 

A telescope is an example of light refraction. A telescope has a few mirrors inside. The light bounces off the mirrors and into your eyes retina.

Putting a straw in a glass of water causes the light to bend. If you look at a curved mirror you will see the opposite of your reflection.

Light can change color when it hits a prism.The light is refracted and the light bends in different angles.