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8 9 5 8 3 6 5 2 7 2 3 5 5 6 7 8 8 9 Required sum = 6 + 7 = 13
What is dendrochronology?
Which vitamin is essential for blood coagulation?
What is the SI unit of temperature?
What element is used to make the filament of an electric bulb?
What is the scientific name of the common pigeon?
Which name is commonly used for "Sirius," the brightest star visible outside our solar system?
Which organization developed a lightweight Carbon-Carbon (C-C) nozzle for rocket engines?
What does the term "specific humidity" refer to?
Who invented the mercury thermometer?
Who discovered the antibiotic streptomycin, used to treat TB?