instruction:
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
question:
He has been on the Chrysanthemum Throne since his father Akihito abdicated in 2019 .
answer:
He acceded to the Chrysanthemum Throne upon the abdication of his father , the now-Emperor Emeritus Akihito on 1 May 2019 at 00:00 local time ( 15:00 UTC ) .


question:
On 13th November 2001 , President Bush signed a military order titled " Detention , Treatment and Trial of Certain Non-Citizens in the War Against Terrorism " .
answer:
On 13 November 2001 , President George W. Bush signed a military order titled the Detention , Treatment , and Trial of Certain Non-Citizens in the War Against Terrorism , which sought to detain and try enemy combatants by military commissions under Presidential authority alone .


question:
The name is because radioactive material " falls out " of the atmosphere into which it is spread during the explosion .
answer:

Nuclear fallout , or fallout , is the residual radioactive material propelled into the upper atmosphere following a nuclear blast , so called because it " falls out " of the sky after the explosion and the shock wave have passed .