They dropped alligator carcasses on the bottom of the ocean floor as an experiment on a better understanding of the underwater food system! :) and this happened in 2020 Jan 11th
Interesting question!
It is a huge misconception that there were no slaves in the north. Slavery was not as common due to the fact that the Northern economy was not as heavily agricultural as in the South. New York and Connecticut had large slave populations. <span> In the North they have cold winters and the South had mild winters. Meaning you would have to provide warmer cloths, food and warmer shelter which would cost slave owners in the North more money</span>
Answer: Through trade with other countries
Hagia Sophia was built under Justinian the first and he ordered many roman style corinthian columns and greek style hellenistic columns imported from Lebanon to support the structure. The famous dome of course was built in the Ottoman style seen on many Islamic architecture today.
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(jacemorris04)