/u/RobertFKennedy's posts in /r/askscience

Year:

Only show posts with narrations

Do Animals and Insects Faint?

1 upvotes

Mark as read: Add to a list

How does a sperm from one species know that it can't procreate with an ovum from another species?

1 upvotes

Mark as read: Add to a list

Energy difference for an average person walking down stairs of 50ft high (horizontal linear distance of 100ft) vs. walking 100ft on flat street.

1 upvotes

Mark as read: Add to a list

Blind hummingbird sits on the passenger seat in a car moving at 100MPH. He then flaps his wings to hover stationary for 3 minutes (not touching anything in the car) like he would normally outside the car. Does the hummingbird hit the back of the car's windscreen?

0 upvotes

Mark as read: Add to a list

Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Do Animals and Insects Faint?	1
How does a sperm from one species know that it can't procreate with an ovum from another species?	1
Energy difference for an average person walking down stairs of 50ft high (horizontal linear distance of 100ft) vs. walking 100ft on flat street.	1
Blind hummingbird sits on the passenger seat in a car moving at 100MPH. He then flaps his wings to hover stationary for 3 minutes (not touching anything in the car) like he would normally outside the car. Does the hummingbird hit the back of the car's windscreen?	0