My science explanation

Are dogs mouths cleaner than humans? You’ve probably heard the saying “Dogs mouths are cleaner than human’s”, but is that true? For our experiment, we used a Petri dish prepared with nutrient agar (a seaweed derivative with beef nutrients added) which is an ideal way to reveal the bacteria hiding all around you. Chemically, agar is a polymer made up of subunits of the sugar galactose, and is a component of the cell walls of several species of red algae that are usually harvested in eastern Asia and California. Agar, as opposed to regular gelatin (like that found in Jelly), is used for culturing bacteria. Agar, unlike gelatin, won't be degraded (eaten) by bacteria. Even though there may be more bacteria in dogs mouths than humans mouths, scientific research shows that dog’s mouths are actually more sterile than humans mouths. The study compared the bacteria cultured from oral swabs with the bacteria cultured from dog-bite victims, to determine which bacteria in the dog's saliva were responsible for causing infections. Dog’s mouths have more good bacteria in their mouths than in human’s mouths, since dogs clean themselves with their tongues and eat strange things. Humans, on the other hand, don’t clean themselves with their tongues, and clean their teeth twice a day, eliminating the use for more good bacteria in their mouths. So, if a dog bites you on one arm and a human bites you on the other arm, you have more chance of getting an infection from the human bite. In conclusion, petri dishes work by using the agar to grow the bacteria, since any other material or chemical would get “eaten” by the bacteria because of the ingredients that go into the agar, so the agar is more like a home for bacteria. Also, dog’s mouths are more sterile because of the amount of good bacteria in their mouths that completely overpower the bad bacteria, so you are more likely to get an infection from a human bite than from a dog bite.

Making Chocolate

Making Chocolate Making chocolate is a long process. First, the chocolate farmers harvest the cocoa beans from the pods that grow on trees, which are found in tropical areas around the equator, usually in Africa. It takes 5 - 6 months for a cocoa pod to be fully grown and ready for harvesting. Once the cocoa pods have been harvested, chocolate farmers extract the cocoa beans from their pods, then cover them with leaves in the sun for 5 - 7 days to ferment. After that, the cocoa beans are left in the sun for 6 days. The cocoa beans are then taken to a collection centre, where they are weighed and checked for quality. Then they are put inside bags and are shipped across the World to factories for processing. The beans are then sorted, cleaned and dried, then grounded down into nibs and then grounded down even more into cocoa liquor, which is processed more into cocoa butter and cocoa powder. Then, the liquor, butter and sugar are mixed together and the chocolate is hardened and packaged then shipped across the World.

Flying Tea bags!

The flying tea bag experiment is quick and easy to do. All you need is a tea bag, a lighter, and some foil to get your humble tea bag to fly.

First, place your tea bag on the foil and light it with the lighter. This causes your tea bag to burn down then suddenly fly up high in the air in ashes. This happens because the air around the fire would grow warm and cold air rushes through the tea bag from the bottom, causing the tea bag to suddenly fly into the air in ashes.

The tea bag then slowly floats down to the ground, although if you put your hand underneath it the ashes will lift up a bit because of your hand’s heat.

In conclusion, the tea bag flies because of the column of hot air rising due to cold air rushing in through the bottom of the tea bag. Once the tea bag is burned down it rises up due to the convection current that the hot and cold air made.