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TIL photoelectric smoke alarms are highly effective at detecting smoldering fires, provide adequate protection from flaming fires. Fire safety experts recommend installing a combination alarm, that either detect both heat and smoke or use both the ionization & photoelectric smoke sensing methods.

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R5NQl TIL about the Amphicar, an amphibious automobile from the 1960s. US President Lyndon B. Johnson owned one, and he was known to frighten visitors at his ranch by driving them downhill directly into his property's lake, all the while shouting that he had malfunctioning brakes.
Z8nPa TIL that a stunning $12 trillion — almost 40 percent of all foreign direct investment positions globally — is completely artificial; it consists of financial investment passing through empty corporate shells with no real activity.
OoA56 TIL that hummingbirds go into a form of hibernation almost every night called torpor. This puts their body into a state of hypothermia in order to save energy and keep them from dying throughout the night while they can't feed.
9rrD TIL In Finland, teachers have the same social status as doctors and lawyers. In 2010, over 6600 applicants vied for only 660 primary school training slots.
knw5 TIL there’s a psychological disorder where you believe that you and everyone you love is already dead. Patients with Cotard’s Disorder often stop eating and believe that they are in heaven or hell.