Not sure how to answer it.
Lincoln wrote the Emancipation Proclamation to free slaves.
Synapses
The synapses that support our knowledge weaken and ultimately degrade-and we forget what we once knew.
Fractional distillation
heated crude oil enters a tall fractionating column , which is hot at the bottom and gets cooler towards the top. vapours from the oil rise through the column. vapours condense when they become cool enough.
