Can you build a raft that really floats? How much weight can your stick raft carry? Can your raft cope in a real stream? This STEM challenge is great fun for kids and a super way to get them stretching and developing thei
A lemon battery experiment involves the useof a juicy lemon, copper coin and zinc nail to form a lemon battery. When four such lemon batteries are combined, they produce enough voltage to light up an LED (light emitting diode).