My time of martial arts was traditional.

Fertilizers are chemicals added to plants to help them grow. Important elements in fertilizers include nitrogen, phosphorus and potassium. Manure (animal waste) is also used as a fertilizer.

Poison ivy produces a skin irritant called urushiol. Touching poison ivy will cause an allergic reaction, usually in the form of an itchy rash on the skin.

There are over 200,000 identified plant species and the list is growing all the time.

Tree resin which has been fossilized is known as amber, it sometimes contains plant material or small animals that were trapped inside.

Bronze is a metal alloy made from copper and tin. Copper makes up the larger amount, usually between 80 to 95%.

Alkali metals such as sodium, potassium, rubidium, caesium and francium are extremely reactive elements, just putting them in water can result in an explosion! They are carefully stored in oil to prevent this happening.

The chemical symbol used for silver is Ag, this comes from the Latin word for silver, argentum.