Whilst you’re eating all that festive food, think about what it is that actually makes you taste. Get hold of a willing friend and pinch their nostrils. Ask them to open their mouth and place a small piece of apple and then onion on their tongue – they should both taste sweet and your volunteer probably won’t be able to identify the food easily. Most of the flavour is produced when you chew the food. In fact we can only taste in 4 ways, sweet, sour, bitter and salty. So when you sit down for Christmas dinner– you’ll also be using your senses of smell, touch, sight and even hearing to see if you want a second helping. If you can’t hear your crisps crunch, smell those roast potatoes or see the turkey turn brown in the oven, it just won’t ‘taste’ right.

	Invigorate the senses of your friends and family – by making them this Bath Bomb.
	Present Tip (From "Zap Amazing Science Experiments" by Paul Holper and Simon Torok)
	You can buy all the ingredients in a supermarket or health shop.
	Pour a small amount of sweet almond oil onto a sheet of greaseproof paper. Use this paper to grease the sides and bases of a large fairy cake tray.
	Into a large bowl, sift 1/2 cup (125ml) of citric acid and 1 1/2 cups (375ml) of bicarbonate of soda. Mix the ingredients together well.
	Take 1/2 cup of this base mixture and put it into another bowl, setting it aside. This will make one bath bomb.
	In a small glass jar, mix together 6 drops of lavender oil. 1/2 teaspoon of sweet almond oil and about 10 drops of your favorite food colouring.
	Put on rubber gloves and pour the liquid form the jar into the 1/2 cup of base liquid. Use you gloved hands to quickly mix it all together. The mixture will be ready when it stays together in your hands without easily crumbling.
	Use a spoon to fill a mould with the mixture. Press it down firmly.
	Repeat steps 3 to 6 until you have used all the base mixture.
	Leave the bombs to set in the mould overnight
	The next day, carefully up-end the moulds on a flat surface to release your bath bombs.
	Run a bath, get in and drop a bomb. Watch it fizz! What’s happening? The citric acid reacts with the bicarbonate of soda producing thousands of bubbles of carbon dioxide gas.