[It is much greater] labour for to withinforth call into mind, without sight of the eye withoutforth upon images, what he before knew and thought upon.

Hair had appeared in greater quantities where I didnʼt want it, and I couldnʼt keep up with the demands of depilation.

Through the Internet, we have access to an unprecedented amassment of information.

IIRC, the official explanation is currently that human history in the Trekiverse diverged from our history in the mid-20th century, due to the cumulative effect of multiple visitations from the future.