Artificial Lungs

Things you need

1. plastic bottle 
2. two balloons                                    
3. straws

Method

cut the bottom of the bottle .make a hole at the center of the other side send a straw through that hole make sure that air cant go through it ,fix a small balloon at the other end .fix a piece of balloon at the open end as a diapram..When the diapram is pulled air is drawn to the balloon and it expands.

Robot Hand

How to make this robot hand 

you need

• flexible conduits
• piece of cardboard
• reel of thread
• straws
• scissor
• five rings
• long ruler   

First you have to draw the shape of your hand in the cardboard.then cut it out .next take the flexible conduit and cut five fingers according to the size of your fingers .add joints so that it would bend.fix the pieces as the fingers of your hand.glue them.tie the pieces  of thread at the top of the fingers.take the thread through the fingers and through the fingers.fix them in the cardboard.fix the ruler as shown in the picture.then fix the ring other end of the thread.