What did the mayans use to them create a calendar?

In an economic downturn, what can happen in countries that depend on high taxes to fund social programs?

During the era of european expansion, what was the biggest reason for spain’s push for exploration?

How are the perspectives presented in the excerpts similar? they show the disappointment and fear mission control workers feel when the lunar module develops problems. they show the huge investment of time and energy mission control workers dedicated to the lunar module. they show how mission control workers view the lunar module as if it is the workers' very own child. they show the relief and excitement mission control workers feel when the lunar module lands on the moon.