Hippocrates and Galen advanced the concept of humorism, a theory which held that we get sick from imbalances of the four basic substances within the human body, which they identified as blood, phlegm, black bile and yellow bile.
If I bought a pair of $190,000 Focal Grande Utopia EM and found out the beryllium isn't any more pure than a pair of $2700 speakers, I'd be very upset. I would also be upset if the beryllium tweeters in my $190K speakers cost less than diamond tweeters in a pair of $5K speakers.
Beryllium: Symbol: Be: Atomic Number: 4: Atomic Mass: 9.012 atomic mass units: Number of Protons: 4: Number of Neutrons: 5: Number of Electrons: 4: Melting Point: 278.0Â° C: Boiling Point: 2970.0Â° C Density: 1.8477 grams per cubic centimeter: Normal Phase: Solid: Family: Alkaline Earth Metals: Period: 2: Cost: $530 per 100 grams