Makato C.R.Parthasarthi

Money is accepted because it solves a huge problem with direct trade, or bartering. Think about it. Without money, you'd have to find someone who not only has what you want, but also wants exactly what you have to offer. That’s incredibly inefficient. Money acts as an intermediary we all agree on.

Ultimately, its acceptance comes down to collective trust. We accept it as payment because we trust that others will accept it from us later. For modern currencies like the Canadian dollar, this trust is reinforced by the government. It's declared "legal tender," and we have faith in the stability of the institutions backing it. It’s really a powerful social convention that makes our complex economy possible.

These metals are very, very reactive. This is the big reason. They react very fast with things in the air. Like the oxygen and the water vapor.

If they touch water, it is a big reaction. It can make fire or a small explosion. It is very dangerous. For sodium and potassium, this reaction is very strong.

So, we must protect them from the air. We put them in oil, like paraffin oil. The oil is like a blanket. It stops the air and water from touching the metal. The metal is safe inside. It does not react with oil.

It’s simple, really. We study the past to make sense of our present. It shows us how we got here and helps us avoid repeating mistakes.

Mountain View is a city in California. You will find it right in the heart of Silicon Valley, on the San Francisco Peninsula. It’s neatly positioned between the larger cities of San Francisco and San Jose. The city is perhaps most famous for being the home of Google's global headquarters, the 'Googleplex'. Its rather pleasant name comes from its views of the Santa Cruz Mountains. It's a key location in the American technology world.

Ah, this is a very annoying problem. For me, it is often about stress and not enough sleep. When the body is tired, it cannot fight sickness well. Also, think about your life. Do you use public transport? Or work near many people, especially children? This is a big reason for exposure to germs.

Your food is also important. Maybe you need more vitamins, like C and D. Poor air quality or smoking can make things worse too. And sometimes, allergies make your nose always a little irritated. This makes it easier for germs to enter. It is many small things.

It's a more hands-on course for a job, like media or engineering. You do lots of practical work and projects. It's another way to get into uni.