"Without water vapor, the Earth's surface would be held fast in the iron grip of frost."Tyndall began studies of Radiative properties of various gases. His experiments demonstrated that water molecules are the best absorber of heat and energy. He was able to conclude that water vapor is the strongest absorber and most important gas controlling the temperature of Earth's surface. https://earthobservatory.nasa.gov/features/Tyndall
Tyndall EffectThe Tyndall effect is one of John Tyndall's most popular discoveries. The effect is the scattering of light as it passes through a colloid. Suspension particles reflect the light and make the beam of light visible to our eyes.
Here is a link to a Khan academy video that does a great job demonstrating the effect
Belfast AddressTyndall addressed a "controversial" subject. He urged the world to study from a naturalistic view rather than a theological view. Many state this started the Science vs. Religion "war."
Spontaneous GenerationAlong with Pasteur, Tyndall was able to prove that no organisms were produced in pure air.