The document discusses various inventions and their uses. It describes how some inventions are very helpful, while others are useless. It notes that safety procedures must be followed when performing experiments in a laboratory, which contains tools like microscopes and test tubes. One person highlighted is Ryan Hreljac, who is described as a genius not for inventing something new but for finding a way to provide clean water to developing countries.

3. Some inventions are very helpful, but others
like this one are very useless.

4. invention (n)
Some inventions are very helpful, but others
like this one are very useless.

6. You have to follow safety procedures when
performing experiments.

7. experiment (n)
You have to follow safety procedures when
performing experiments.

9. In a laboratory you can use tools like the
microscope and test tubes.

10. laboratory (n)
In a laboratory you can use tools like the
microscope and test tubes.

12. Ryan Hreljac is a genius. Not because he invented
something new, but because he found a way to give
clean water to people in developing countries.

13. genius (n)
Ryan Hreljac is a genius. Not because he invented
something new, but because he found a way to give
clean water to people in developing countries.

15. The Swiss knife is a gadget that contains several
cutting tools. Now it even includes a pen drive.

16. gadget (n)
The Swiss knife is a gadget that contains several
cutting tools. Now it even includes a pen drive.

18. The electric versions of some usual things are
inventions that make our lives easier or funnier.

19. electric (adj)
The electric versions of some usual things are
inventions that make our lives easier or funnier.

21. A headache is a signal that
there is something wrong in your body.

22. signal (n)
A headache is a signal that
there is something wrong in your body.

24. Oil spills are occasional accidents that
happen while transporting fuel.

25. occasional (adj)
Oil spills are occasional accidents that
happen while transporting fuel.

26. OCCASIONAL BIRTHDAY

27. OCCASIONAL BIRTHDAY
When you are born in a leap year,
you celebrate your birthday every 4 years.