Animals (mostly bones) and trees
Hope this was what you were asking for :)
frequency's unit is Hz which mean cycles per second
given frequency * wavelength = speed of wave
speed of light = 3x10^8 m/s
wavelength = 680nm = 680x10^-9 m
frequency * 680x10^-9 m = 3x10^8 m/s
frequency = 3x10^8 / 680x10^-9
= 4.41x10^14 Hz
= 441x10^12 Hz
= 441 THz
which is the frequency for red light
Important changes in the Middle East between the 13th and 15th centuries include the 13 Century end of the First Crusade and the capture/founding of Jerusalem. After that came the rise of the Mongol/Turkish/Ottoman Empire during the 14th Century. The Ottoman transcontinental Empire controlled much of North Africa, Western Asia, and Southeast Europe. This led to the creation of important transcontinental trade routes and a boom of economic trade between the continents.
Pushing the Mongols north and fighting them, and the rebuilding of Beijing caused the Chinese decision to abandon major expeditions.
The Warren Court refers to the Supreme Court of the U.S. during the period when Earl Warren served as Chief Justice. Warren replaced the deceased Fred M. Vinson as Chief Justice in 1953, and Warren remained in office until he retired in 1969. Warren was succeeded as Chief Justice by Warren Burger.
Warren led a liberal majority that used judicial power in dramatic fashion, to the consternation of conservative opponents. The Warren Court expanded civil rights, civil liberties, judicial power, and the federal power in dramatic ways.
The court was both applauded and criticized for bringing an end to racial segregation in the United States, incorporating the Bill of Rights, i.e. including it in the 14th Amendment Due Process clause, and ending officially sanctioned voluntary prayer in public schools. The period is recognized as the highest point in judicial power that has receded ever since, but with a substantial continuing impact.
Prominent members of the Court during the Warren era besides the Chief Justice included Justices William J. Brennan, Jr., William O. Douglas, Hugo Black, Felix Frankfurter, and <span>John Marshall Harlan II</span>
