Here's why:
* The "u" in "humor" is pronounced like the "u" in "cup" or "sun." This is a short vowel sound, as it's quick and doesn't have a drawn-out "oo" sound.
* Long vowel sounds are typically represented with a vowel followed by a silent "e" at the end of a word (like "hope" or "bike"), or by a double vowel (like "moon" or "food").
Let me know if you'd like to explore other vowel sounds!