A GitClear analysis of 623 million code changes from 2023-2026 reveals that heavy AI tool users increased output by 25% compared to their prior velocity, but code duplication rose 81%. While AI-adopting teams outproduce peers by 4-10x, ROI remains unclear as output gains don't necessarily translate to business value, and code quality concerns are mounting.
Jscpd v5 is a Rust-based copy/paste detector for 224+ programming formats that uses language-aware tokenization and the Rabin-Karp algorithm to find exact, renamed (Type-2), and near-miss (Type-3) code clones across files. It ships as a self-contained binary available on multiple platforms and package managers, with support for CI/CD integration, baseline comparisons, and 15 different output reporters.
A 2005 study by Dehal and Boore reconstructed evolutionary relationships across tunicate, fish, mouse, and human genomes to investigate whether vertebrate complexity arose from two ancient whole genome duplications. By analyzing paralogous genes duplicated before the fish-tetrapod split, they found clear patterns of four-way paralogous regions across the human genome, providing strong evidence for two distinct whole genome duplication events in early vertebrate evolution.