Probably the best approach.
You could suggest a passphrase or two from some joke or story or nonsense remark you share with your sister, that the parents don't know about, even something that used to make her mad when you said it. Then, if she didn't want you to know the passphrase, she could pick something similar from some interaction with a different friend, imaginary or real. It might even contain some punctuation. She won't have any trouble remembering something like this.
In the '70s, a Nobel laureate in physics, Ivar Giaever, an expert in thin films, took a sabbatical in San Diego to investigate immunology out of deep curiosity. Among the things he came up with was a carefully designed film of indium which could be deposited onto a glass microscope slide. You could then dip half the slide into a solution containing the antibody, rotate the slide 90 degrees and dip into a solution containing the antigen. If there were enough antigen present in the second solution, the quadrant of the slide on which antigen-antibody complexes were stuck was visibly different from the other quadrants in ordinary light, even though the antibody and antigen layers were one molecule thick. I don't know whether anything came of this later. He was thinking about a cheap and easily administered clinical test at the time.
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They don't initiate lawsuits in August anymore. Only in the other 11 months.
Probably the best approach. You could suggest a passphrase or two from some joke or story or nonsense remark you share with your sister, that the parents don't know about, even something that used to make her mad when you said it. Then, if she didn't want you to know the passphrase, she could pick something similar from some interaction with a different friend, imaginary or real. It might even contain some punctuation. She won't have any trouble remembering something like this.
Or in factored form: 2 ^ 6 x 5 x 19 x 12043 x 216493 x 836256 503069 278983 442067
From this you can make lots of other expressions for the number.
In the '70s, a Nobel laureate in physics, Ivar Giaever, an expert in thin films, took a sabbatical in San Diego to investigate immunology out of deep curiosity. Among the things he came up with was a carefully designed film of indium which could be deposited onto a glass microscope slide. You could then dip half the slide into a solution containing the antibody, rotate the slide 90 degrees and dip into a solution containing the antigen. If there were enough antigen present in the second solution, the quadrant of the slide on which antigen-antibody complexes were stuck was visibly different from the other quadrants in ordinary light, even though the antibody and antigen layers were one molecule thick. I don't know whether anything came of this later. He was thinking about a cheap and easily administered clinical test at the time.