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Isotopes are two or more types of atoms that have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), and that differ in nucleon numbers (mass numbers) due to different numbers of neutrons in their nuclei. While all isotopes of a given element have almost the same chemical properties, they have different atomic masses and physical properties.
Isotope - Wikipedia
en.wikipedia.org
I ask the fundamental question of rationality: why do you believe what you believe? What do you think you know and how do you think you know it?
Harry Potter and the Methods of Rationality
Eliezer Yudkowsky
While top-line bookings growth is super important, investors want to understand how profitable that revenue stream is. Gross profit provides that measure.
What’s included in gross profit may vary by company, but in general all costs associated with the manufacturing, delivery, and support of a product/service should be included.
16 Startup Metrics | Andreessen Horowitz
a16z.com
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