Which gas is responsible for the characteristic smell often associated with rain after a dry spell?

Which type of mirror is commonly used in vehicle side mirrors to provide a wider field of view?

Which respiratory condition involves inflammation and narrowing of the airways causing difficulty in breathing?

Which scientist is credited with developing the first successful smallpox vaccine?

Which type of lens is used to correct hyperopia or farsightedness?

Which gland in the human body is often referred to as the master gland because it controls other endocrine glands?