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Snakes
There are about 2,600 different kinds of snakes. About 400 are poisonousk, but more are, harmless. In size, they very enormously: the smallest are 12 centimetres long, the biggest are up to 10 metres and weigh 250 kilos. Snakes don’t need energy from food (the sun heats their bodies), so they can survive for months without eating.
Sharks
The average lifespan of a shark is about 25 years but some can live to be 100. They are unusual in that they have no bones in their body, and large sharks may have up to 4,000 teeth. They are very dangerous when they hunt, but only a few attack humans: more people die from bee stings than from shark attacks.

Batman is one of the most popular heroes of DC Comics Universe. First time he was mentioned in Detective Comics No27 in May, 1939. He has no special powers or abilities. His true name is Bruce Wayne and he's a billionaire. He's a very clever and well-educated man. So, all his "powers" are created by himself. As usual, he overcomes his enemies with stratagem and his self-created weapons. Also he is famous with his Batmobile. It's a great car with incredible abilities. It's also made by himself. He's also known as Dark Knight. Gotham is the city, protected by Batman. Joker is his most famous enemy. I think he's one of the greatest heroes in all comics Universe.

Living in the slums is hard.  People there have no comfortable homes, no jobs and a lot of free time.  All these lead to misery and crime.  To improve life in the slums means to demolish them completely.  But this is too radical and costly.  If this is not possible, improvements can start with finding jobs for the people who live in the slums.  If they have work, they will have money to buy food, clothes and will finally rent better apartments to live in.  Another way to improve slums is to repair the houses and to build better new houses.  Providing opportunities for better education for the children from the slums can finally result in their leaving the slums and living happier life elsewhere.