A.Human teeth are made of pulp, surrounded by dentine, which is similar to bone. This is surrounded by enamel, which is the hardest substance in the body.
Q.How many bones do we have
A.Human adults normally have 206 bones. A newborn has 300, but many fuse during infancy. An adult hand has 27 bones, a foot 26. The femur is the biggest.
Q.didn't dog poo used to be white?
A.Dogs' diets changed during the 1970s. They now eat less bone & more food low in calcium, so the colour of their faeces has changed from white to brown.