MAC-deepinquiry/verified-facts-sample-500

DeepInquiry Verified Facts (Sample-500)

A 500-fact sample of the DeepInquiry verified-facts corpus. Each fact is a single factual statement that has been checked against several sources that do not copy one another, and each record carries the sources behind it.

The full corpus holds roughly 3,000 approved facts and grows every day. It is available by API and as a licensed dataset (see Full corpus).

What is in the sample

• 500 facts: 482 Gold and 18 Silver.
• 11 categories: science (188), history (144), world events (40), technology (36), nature (35), culture (25), other (14), psychology (10), space (4), geography (2), mathematics (2).
• 2,544 cited sources, a median of 5 per fact.
• Every record links to the fact's public page on deepinquiry.ai.
• Near-duplicate statements were removed so that each fact covers a distinct subject.

Files

File	Format	Rows
data/train.jsonl	One JSON record per line, with a sources list	500
data/train.csv	Flat table; source URLs joined with |	500

Fields

Field	Type	Description
id	int	Stable identifier of the fact in the DeepInquiry corpus
fact_text	string	The fact, as one statement
category	string	Subject category
era	string	Period the fact concerns
region	string	Geographic scope
verification_tier	string	gold or silver (see below)
independence_score	float	0 to 1; how independent the supporting sources are from one another
cluster_count	int	Number of independent source groups supporting the fact
surprise_score	int	1 to 10; how unexpected the fact is to a general reader
confidence_level	string	high, medium or low
url	string	The fact's public page
sources	list	{url, title} for each cited source (JSONL only)

How facts are verified

DeepInquiry does not count sources; it counts independent evidence. Sources are grouped by the evidence they trace back to, so two hundred outlets reprinting one wire story count once. Wikipedia, its mirrors and content aggregators are excluded from the corroborating set whenever an original source is available. A fact is graded Gold, Silver or Bronze by how much independent evidence stands behind it. The full method is published at deepinquiry.ai/methodology.

Intended uses

• Grounding and evaluation for retrieval-augmented generation.
• Research on fact-checking and source independence.
• Reference content for education, quiz and trivia products (non-commercial use under this sample's license).

Limitations

• A Gold grade means independent sources agreed when the fact was checked. It is not a guarantee; sources can be wrong, and knowledge changes.
• English only. The corpus leans toward science and history, and toward sources published in North America and Europe.
• This sample was drawn on 29 September 2026. Facts in the live corpus may since have been revised or withdrawn.
• The sample contains no personal data about private individuals.

License

This sample is released under Creative Commons Attribution-NonCommercial 4.0 (CC BY-NC 4.0). It may be used, shared and adapted for non-commercial purposes with attribution:

DeepInquiry Verified Facts (Sample-500), Machine Accountability Corporation, CC BY-NC 4.0. https://huggingface.co/datasets/MAC-deepinquiry/verified-facts-sample-500

Commercial use, including product integration and AI model training, requires a DeepInquiry license. The cited source pages remain the property of their publishers.

Full corpus

• API: free tier of 2,500 requests per month; paid plans from $59 per month. deepinquiry.ai/pricing
• Data license: the full corpus with sources, quality grades and regular updates, for research, commercial and enterprise use. deepinquiry.ai/data-license
• Contact: hello@deepinquiry.ai

Citation

@misc{deepinquiry_sample_500,
  author       = {{Machine Accountability Corporation}},
  title        = {DeepInquiry Verified Facts (Sample-500)},
  year         = {2026},
  publisher    = {Hugging Face},
  howpublished = {\url{https://huggingface.co/datasets/MAC-deepinquiry/verified-facts-sample-500}}
}