DavidHull

Yes. The single particle interferes with itself. However the effect disappears if you measure which slit the particle went through.

As an interested amateur, I recommend the book "Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime" by Sean Carroll as a good overview of quantum fundamentals. The book discusses several interpretations of the reality of matter at the quantum level. Dr. Carroll himself believes that everything is waves/fields at the lowest level, and a many-worlds interpretation of why matter appears to be particles when we observe it, but also discusses de Broglie–Bohm pilot wave theory and spontaneous collapse theory.

https://en.wikipedia.org/wiki/Many-worlds_interpretation https://en.wikipedia.org/wiki/Interpretations_of_quantum_mec...

Actually, the cmd/ctl-z advice is actually moderately useful. If you type it immediately after the closing formatting character it undoes the wysiwyg formatting. (I'm not arguing against a way to turn the wysiwyg input window off, however.)

According to the VFITX portfolio page (https://investor.vanguard.com/mutual-funds/profile/portfolio...), the average maturity of its holdings in 6 years, which probably explains why its performance is different than that of a 3 year treasury bond.

These books were created from Feynman's lectures to freshman and sophomore Caltech students. I have not looked at the books in detail, but I think that a dedicated reader who is comfortable with calculus should be able to understand them.

The source file is critbit.w. See <http://en.wikipedia.org/wiki/Literate_programming>.

Also, Netflix doesn't have to make a customer wait, they can just send a movie from farther down in the customer's queue.

No, I have not noticed an extra delay by doubling up two discs in one envelope.

Usually the mail delivery between the local Netflix center and my address is overnight both ways, but occasionally it takes two days for an envelope I return to be processed. I've attributed that delay to the post office, however, and not to having two DVDs in the same envelope.

Yes, I agree, the premise that Netflix wants you to return the DVDs as quickly as possible so that they can send it to someone else is wrong. At any given time, you're going to have N DVDs out, and Netflix doesn't have any reason to particularly care whether they're the same N DVDs each day or N different DVDs.

When I return two DVDs to Netflix on the same day, I usually send them in one envelope in the hopes that the mailing costs will be slightly lower. (I figure that if their costs are lower that helps keep the subscription price down.) I've wondered why Netflix doesn't try to combine the discs that they send, but perhaps the cost savings aren't enough to be worth the extra handling that would be required on their end.