input question: To make a color of oil paint darker,

output answer: squeeze equal amounts of the original color and a darker color onto a palette, and mix them with a palette knife blade, adding more of either color to adjust the shade.

input question: How to properly house a whale?

output answer: House it is a water proof open tank filled with water, keep the top open so that the whale can breathe.

input question: How do I stop the duct tape end from disappearing?

output answer:
When you are finished with a project, use a paperclip, stuck to the end of the tape, so give you the end easier next time.