Snowball sampling (also called chain-referral sampling) is a non-probability sampling method in which existing study participants recruit future participants from among their own acquaintances. A ...

California’s SB 942 AI Transparency Act took effect August 2, 2026 — not the January 1, 2026 date still cited across much of the web — after AB 853 delayed it to align with the EU AI Act. It requires ...

A thesis or dissertation follows a recognizable structural pattern, but the exact chapter breakdown, front-matter order, and formatting rules vary by institution, department, and discipline. This ...

A flammable liquid storage cabinet is the most common way research labs keep solvents and other flammable liquids close to the bench while staying compliant with OSHA’s Flammable Liquids standard, 29 ...

The “GPO safe harbor” is the regulatory exemption at 42 CFR 1001.952(j) that allows a group purchasing organization (GPO) to collect an administrative fee from vendors on purchases made by its member ...

A sentinel mouse is not part of a study — it is a diagnostic instrument. Sentinel animals are placed into a rodent colony specifically so they can be tested on a fixed schedule for pathogens that ...

RAMESES publication standards: realist syntheses — 19 standards covering how to report a realist review (a secondary-research synthesis of existing literature), addressing the study’s rationale, its ...

A “frontier AI model” is not a specific product, and it is not a specific company’s model. It is a capability class: a model at or near the current edge of what AI systems can do. What varies — and ...

A nursing-sensitive indicator is a quality measure whose result is affected, provided, or influenced by nursing personnel — but for which nursing is not the exclusive driver. That’s not a loose ...

Synthetic data — records generated by a model or algorithm rather than collected from real-world observation — is increasingly proposed as a way to make sensitive research data shareable, or to fill ...

The Hill coefficient (nH) sets how steeply a dose-response or binding curve rises. Here’s what nH=1, nH>1, and nH<1 actually indicate, and why the curve shape alone never proves true molecular ...

Operationally, a study is gain-of-function research when its design intentionally increases a biological agent’s capability relative to its baseline — commonly transmissibility, virulence, host range, ...