collegehumor:

Secret Agent Cat
Only got nine lives to lose

collegehumor:

Secret Agent Cat

Only got nine lives to lose

collegehumor:

A Pastor’s Relationship Advice
The -az family has since changed their suffix.

collegehumor:

A Pastor’s Relationship Advice

The -az family has since changed their suffix.

maslov:

Bloom

maslov:

Bloom

science-junkie:

Why trees can’t grow taller than 100 metres

TYPICALLY, the taller the tree, the smaller its leaves. The mathematical explanation for this phenomenon, it turns out, also sets a limit on how tall trees can grow.

Kaare Jensen of Harvard University and Maciej Zwieniecki of the University of California, Davis, compared 1925 tree species, with leaves ranging from a few millimetres to over 1 metre long, and found that leaf size varied most in relatively short trees.

Jensen thinks the explanation lies in the plant’s circulatory system. Sugars produced in leaves diffuse through a network of tube-shaped cells called the phloem. Sugars accelerate as they move, so the bigger the leaves the faster they reach the rest of the plant. But the phloem in stems, branches and the trunk acts as a bottleneck. There comes a point when it becomes a waste of energy for leaves to grow any bigger. Tall trees hit this limit when their leaves are still small, because sugars have to move through so much trunk to get to the roots, creating a bigger bottleneck.

Jensen’s equations describing the relationship show that as trees get taller, unusually large or small leaves both cease to be viable (Physical Review Letters, doi.org/j6n). The range of leaf sizes narrows and at around 100 m tall, the upper limit matches the lower limit. Above that, it seems, trees can’t build a viable leaf. Which could explain why California’s tallest redwoods max out at 115.6 m.

Source: New Scientist.
Images: 1 - 2 - 3 - 4

collegehumor:

9 Less Controversial PSAs [Click for the rest]
Think of these as Public Consensus Announcements.

collegehumor:

9 Less Controversial PSAs [Click for the rest]

Think of these as Public Consensus Announcements.

collegehumor:

Humor Us - Staff Jokes [Click for the rest]
Whether you’re dancing, gaming, jamming, or watching football, make this a great (and weird) weekend.

collegehumor:

Humor Us - Staff Jokes [Click for the rest]

Whether you’re dancing, gaming, jamming, or watching football, make this a great (and weird) weekend.

collegehumor:

The 10 Best Best Friends of All-Time [Click for full list]
Disagree with our list? Good news! You can vote for who you think has the best wolf pack.

collegehumor:

The 10 Best Best Friends of All-Time [Click for full list]

Disagree with our list? Good news! You can vote for who you think has the best wolf pack.

collegehumor:

Garlic Allergy is Serious
Whatever, serious is a subjective term.

collegehumor:

Garlic Allergy is Serious

Whatever, serious is a subjective term.

slit-mywrists:

I wish i had a boyfriend like Guy from Willow. I want someone who will kiss my scars, and actually care about me and help me out of my depression and to help me to stop cutting. That would be the cutest thing ever.