Mathematically Correct Breakfast - How to Slice a Bagel into Two Linked Halves. If a torus is cut by a Möbius strip it will split up into to interlocking rings.

It is not hard to cut a bagel into two equal halves which are linked like two links of a chain. Figure 1:

To start, you must visualize four key points. Center the bagel at the origin, circling the Z axis. A is the highest point above the +X axis. B is where the +Y axis enters the bagel. C is the lowest point below the -X axis. D is where the -Y axis exits the bagel.

These sharpie markings on the bagel are just to help visualize the geometry and the points. You don’t need to actually write on the bagel to cut it properly.

The line ABCDA, which goes smoothly through all four key points, is the cut line. As it goes 360 degrees around the Z axis, it also goes 360 degrees around the bagel.

The red line is like the black line but is rotated 180 degrees (around Z or through the hole). An ideal knife could enter on the black line and come out exactly opposite, on the red line. But in practice, it is easier to cut in halfway on both the black line and the red line. The cutting surface is a two-twist Mobius strip; it has two sides, one for each half.

After being cut, the two halves can be moved but are still linked together, each passing through the hole of the other.

It is much more fun to put cream cheese on these bagels than on an ordinary bagel. In additional to the intellectual stimulation, you get more cream cheese, because there is slightly more surface area. Topology problem: Modify the cut so the cutting surface is a one-twist Mobius strip. (You can still get cream cheese into the cut, but it doesn’t separate into two parts). See more at:Mathematically Correct Breakfast: How to Slice a Bagel into Two Linked Halves by George W. Hart.

Chance The Rapper & The Social Experiment - Wonderful Everyday (Arthur theme)

Most fans of Chance The Rapper know that he’s been performing the theme song to the children’s show Arthur during live shows for a little while now. I had seen some low-quality phone videos of it (because there is literally nothing unappealing about the previous sentence) but I wasn’t quite ready for just how powerful it ended up being when I saw him at Governors Ball. It’s a song that translates surprisingly well from a television show aimed at a younger audience - it’s surprisingly universal in its message. As soon as that first note started playing, the entire crowd erupted; Chance is the type of figure that inspires a little fervency from his fans, and it seemed like most of the crowd had been waiting for it. It was a highlight of a set that was a highlight of the entire festival, and now there’s a beautifully textured and rich recorded version for everyone to enjoy with additional vocals by Jessie Ware, Wyclef Jean, and others.

Mathematically Correct Breakfast - How to Slice a Bagel into Two Linked Halves. If a torus is cut by a Möbius strip it will split up into to interlocking rings.

It is not hard to cut a bagel into two equal halves which are linked like two links of a chain. Figure 1:

To start, you must visualize four key points. Center the bagel at the origin, circling the Z axis. A is the highest point above the +X axis. B is where the +Y axis enters the bagel. C is the lowest point below the -X axis. D is where the -Y axis exits the bagel.

These sharpie markings on the bagel are just to help visualize the geometry and the points. You don’t need to actually write on the bagel to cut it properly.

The line ABCDA, which goes smoothly through all four key points, is the cut line. As it goes 360 degrees around the Z axis, it also goes 360 degrees around the bagel.

The red line is like the black line but is rotated 180 degrees (around Z or through the hole). An ideal knife could enter on the black line and come out exactly opposite, on the red line. But in practice, it is easier to cut in halfway on both the black line and the red line. The cutting surface is a two-twist Mobius strip; it has two sides, one for each half.

After being cut, the two halves can be moved but are still linked together, each passing through the hole of the other.

It is much more fun to put cream cheese on these bagels than on an ordinary bagel. In additional to the intellectual stimulation, you get more cream cheese, because there is slightly more surface area. Topology problem: Modify the cut so the cutting surface is a one-twist Mobius strip. (You can still get cream cheese into the cut, but it doesn’t separate into two parts). See more at:Mathematically Correct Breakfast: How to Slice a Bagel into Two Linked Halves by George W. Hart.

Lytro Illum review: this is the camera of the future
Every once in a while, the Lytro Illum blew my mind. I’d take just the right picture at just the right moment, and I’d suddenly have it captured in a way that felt more real, more alive than anything else I could’ve done. For every one of those moments, though, there were three or four moments where I felt like I missed it: I didn’t get the shot right in time, or it didn’t have the right composition or light. I just wound up with a plain-old photo, and not a particularly good one. Too many times I wound up wishing I’d just grabbed my phone.