I was interested in what was going going on outside the window.
Describing it how? are you talking about comparing and contrasting.... or there similarities.... How it benefits people.... how it could be dangerous....
Answer:
https://www.cnbc.com/2015/05/27/sensorwake-this-alarm-will-wake-you-up-with-the-smell-of-cash-or-croissants.html
Explanation:
I guess formal and informal refer to two types of essay - you can write a formal essay where you avoid conversational language and such and where you need to be very professional, or you can write informally where you don't have to think about such things, it is very casual.
