person who carries out academic or scientific research. People who work to find new facts and ideas.

something difficult to understand or explain. Books, plays, or films about solving a strange crime.

branch of science concerned with nature and properties of matter and energy. The study of heat, light, and energy on objects.

The way in which the parts of a system or object are arranged or organized, or a system arranged in this way. To plan, organize, or arrange the parts of something.

engaging in speech. action of talking. To make a formal speech about something.

having specified appearance. To appear to be when you look at them; seem.

taking account of when reaching total. To include someone or something in a final number.

Quality of being strange and not understood.

plan or course of action. Plan to achieve a desired result. To determine the value or importance of something.

remark expressing opinion. Some things you say, giving opinions; remarks. To say something that gives your opinion.

having all necessary parts. To finish or reach the end of doing something.

Four-sided structure with sides meeting at the top. arrange in shape of pyramid.

Being unfamiliar or not known. unknown person or thing.

To put something in a new place.

Being what was wanted or needed. used to greet someone in polite or friendly way. instance or manner of greeting someone. To accept or receive something happily and gladly.