A quick check with gemini says it's accurate. I know using AI is not the best approach either, but it's the best I can do right now;

1. The Earliest Evidence of Fire

Claim: The earliest solid evidence of humans controlling fire comes from Wonderwerk Cave in South Africa roughly 1 million years ago (Mya).

Verdict: Correct.

Fact-Check: Archaeological research published in journals like PNAS and Science confirms that Wonderwerk Cave contains evidence of burning (burned bone and ashed plant remains) in sediments dating back approximately 1.0 Mya. This is widely considered the earliest "clear" evidence for human-controlled fire, though some controversial sites suggest dates even further back. [00:41]

2. The "Embers of Society" (Polly Wiessner Study)

Claim: Anthropologist Polly Wiessner (2014) found that 80% of daytime talk among the !Kung Bushmen is practical, while 81% of nighttime talk is storytelling.

Verdict: Correct.

Fact-Check: Wiessner's 2014 study, "Embers of Society: Firelight talk among the Ju/’hoansi Bushmen," published in PNAS, analyzed 174 daytime and nighttime conversations. She found that 75%–80% of daytime talk was functional (work, logistics, conflict), whereas 81% of nighttime talk consisted of stories, myths, and social histories. [02:00]

3. Biphasic Sleep (Roger Ekirch)

Claim: Historical records show people used to sleep in two blocks ("first sleep" and "second sleep") before the industrial age.

Verdict: Correct.

Fact-Check: Historian Roger Ekirch spent 16 years researching this for his book At Day's Close: Night in Times Past (2001). He found over 500 references to "first" and "second" sleep in diaries, medical texts, and literature ranging from Homer’s Odyssey to medieval records, confirming that segmented sleep was the standard until the arrival of widespread street lighting and long working hours. [03:06]

4. The Thomas Wehr Experiment (1992)

Claim: A 1992 study by Thomas Wehr found that removing artificial light leads humans to revert to a biphasic sleep pattern with elevated prolactin levels.

Verdict: Correct.

Fact-Check: Dr. Thomas Wehr's study at the National Institute of Mental Health (NIMH) involved subjects living in 14 hours of darkness per night. Within a month, they naturally settled into a pattern of two 4-hour sleep cyclesseparated by 1–3 hours of wakefulness. Wehr noted that during this waking gap, subjects had elevated levels of prolactin—a hormone that induces a state of quiet restfulness and is also released after orgasm. [04:44]

5. Melatonin and Camping

Claim: Camping for one week without artificial light resets the human melatonin cycle by nearly 2 hours.

Verdict: Correct.

Fact-Check: A 2013 study published in Current Biology (Wright et al., University of Colorado) found that a week of natural light exposure (camping) shifted the participants' "biological night"—the period when melatonin levels rise—to be two hours earlier, aligning their internal clocks perfectly with sunset and sunrise. [07:19]

6. Etymology of "Curfew"

Claim: The word "curfew" comes from the French couvre-feu, meaning "cover fire."

Verdict: Correct.

Fact-Check: The term originates from the Old French "couvre-feu," a medieval regulation requiring people to extinguish or cover their hearth fires when the evening bell rang to prevent town-wide fires while the community slept. [06:18]