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

invention (n)

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

You have to follow safety procedures when performing experiments.

experiment (n)

You have to follow safety procedures when performing experiments.

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

laboratory (n)

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

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.

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.

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

gadget (n)

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

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

electric (adj)

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

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

signal (n)

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

Oil spills are occasional accidents that happen while transporting fuel.

occasional (adj)

Oil spills are occasional accidents that happen while transporting fuel.

OCCASIONAL BIRTHDAY

OCCASIONAL BIRTHDAYWhen you are born in a leap year,

you celebrate your birthday every 4 years.