Here is a concise summary of the provided text:
**Title:** The Dangers of Venomous Spiders
**Summary:**
* A narrative begins with a person encountering a black widow spider in their newly rented forest house, highlighting the spider's deadly neurotoxin (15 times stronger than a rattlesnake's venom).
* The text describes the effects of a black widow spider bite, including:
1. Initial pain and swelling
2. Neurotoxin spread through the body, causing muscle cramps, paralysis, and breathing difficulties (within 1-12 hours)
3. Eventual recovery (after 2-3 days) for those with strong immune systems
* The text also briefly mentions other venomous spiders:
+ Brown Recluse Spider: causes necrotic lesions, healing in 3 weeks to 3 months
+ Wandering Spider (Banana Spider): induces heavy salivation and heartbeat disruption
+ Wolf Spider: relatively harmless to humans, causing redness, swelling, and itching
**Ending:** The narrative concludes with a historical note on ancient, massive sea scorpions (mistakenly classified as arachnids) and an invitation to engage with more content.
Here are the key facts extracted from the text, without opinions, in short sentences with numbers:
**General Facts**
1. The story begins with a person renting a small house in the forest to escape city life.
2. The house has no electricity, which the person attempts to fix in the basement.
**Black Widow Spider Facts**
3. The person is bitten by a black widow spider in the basement.
4. Black widow spiders have a distinctive red hourglass shape on their body.
5. The spider's venom is 15 times stronger than a rattlesnake's.
6. Black widow spiders prefer secluded, quiet places like attics and barns.
7. Female black widow spiders are protective of their offspring.
8. The spider's fangs are small but very sharp, injecting poisonous glands into the victim.
**Black Widow Spider Bite Symptoms**
9. Initial symptoms of a black widow spider bite may not be painful but include two small red dots at the bite site.
10. Within 15 minutes, the affected area (e.g., hand) may start to cramp.
11. A neurotoxin protein in the venom affects the nervous system, leading to muscle contractions and diluted blood vessels.
12. Symptoms spread throughout the body, causing muscle aches, convulsions, and difficulty walking (within 3 hours).
13. Further symptoms include fever, sweating, sticky skin, breathing difficulties, and a slowed heartbeat (within 12 hours).
14. Symptoms typically subside after 2-3 days as the body recovers.
**Medical Response**
15. People with weak immune systems may require medical attention and an antidote to recover from a black widow spider bite.
**Other Spider Facts**
16. Brown recluse spider bites are not very painful but can cause redness, swelling, and blistering within 3-8 hours.
17. Wandering spider (banana spider) venom causes heavy salivation and disrupts heartbeat.
18. Wolf spider bites are not dangerous for humans, causing only redness, swelling, and itching.
19. Wolf spiders do not weave webs; they hunt by chasing prey.
20. Orb-weaving spiders can create extremely long webs (up to 140 meters).