1. Sun darkens skin because it triggers the production of melanin, a brownish-black pigment that helps filter out harmful ultraviolet rays. It lightens hair because the UV light triggers the breakdown of these selfsame melanin molecules into simpler and evidently less colorful compounds.

2. Because opening the mouth helps to stretch and firm the skin for easier application.

3. Because the glue dries when the solvent in the glue evaporates. When the lid is on there is not enough air in the bottle to evaporate the solvent.

4. Because psychics are frauds.

5. Comes from latin 'brevis' (short). ad+breviāre (to shorten) and finally evolving to 'abbreviation' from middle english.

6. Initially ...

1. Sun darkens skin because it triggers the production of melanin, a brownish-black pigment that helps filter out harmful ultraviolet rays. It lightens hair because the UV light triggers the breakdown of these selfsame melanin molecules into simpler and evidently less colorful compounds.

2. Because opening the mouth helps to stretch and firm the skin for easier application.

3. Because the glue dries when the solvent in the glue evaporates. When the lid is on there is not enough air in the bottle to evaporate the solvent.

4. Because psychics are frauds.

5. Comes from latin 'brevis' (short). ad+breviāre (to shorten) and finally evolving to 'abbreviation' from middle english.

6. Initially boxing consisted of a ring of spectators around the combatants. It was in 1839 when the London Prize Ring Rules introduced the use of a 24 square-foot boxing ring with ropes surrounding it.

7. So that the lid does not shift during transport or after burial in the event the body needs exhumed.

8. The word 'practice' has many meanings listed in the dictionary. One of them is: The exercise of a profession.

9. Both are 'falling' but the heavier rain "drops" faster.

10. Because you are 'starting' the shut down process.

11. To limit distraction and allow the visual cortex more focus.

45. Because that's where flights officially end, or "terminate".

44. 'con' is not a prefix in 'congress'. The word finds its origin equiv. to congred(ī) to approach, meet (con- con- + -gredī, comb. form of gradī to step

43. Because each 'apartment' is apart from one another. So grouped they become 'compartment'

42. Wool on a sheep have oils from the sheep's skin.

38. No

22. Sir or Mr.