| When the contrast in the photo of M87 is increased, the concentrated light appears to extend beyond the main "ring" around the black hole. Does it represent any physical entity (accretion disk) or is it an artifact of the image? | 1 | | | | |
| Why is there no absolute speed? | 1 | | | | |
| Why do humans pass out so quickly from a vaccuum? | 1 | | | | |
| What is the effect of blood donation on Oxygen absorption? | 1 | | | | |
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