NASA: The Carbon Cycle [720p]

What have I learned today.

I've learned what is carbon cycle and how it works. First, animals breathe oxygen and breathe out carbon dioxide. Then carbon flies to the tree or a plant. Then the tree make an oxygen that we breathe. Then we started to polute it even more by building towers and big cities.Then it's all starts all over again. I also have learned that polar bears, pengins and other species are dying because of global warming. So to stop it the things you need to do are: ride a bycicle instead of cars, recycle,turn off the lights when you leave etc. Bye.

Burglar alarm

We have started our burglar alarm. It's a shoebox that you make a circuit in. It is pretty hard but I almost finished. We also need to decorate it inside and outside. You need 5 switches to be connected and working.

Also you will need a light bulb, battery, and many many wires.
Buzzer is the funniest thing. It's buzzing when you connect it to the battery. We are using our school's staff such as wires and batteries, buzzer, motors. Sometimes you need to insulate your wires. It's really hard to strip it. And it's cool too.