Radioactive elements are produced in nature and scientific experiments.

This software has forward compatibility.

This software maintains backward compatibility.

He was diagnosed with congestive heart failure.

I need a heat-killing bee ball in my garden.

The Great Vowel Shift played a significant role in the history of English.

A Dumeril's monitor is a very rare reptile.

The bat-eared fox is known primarily for eating insects.

Finding the Summer Triangle is helpful for remembering constellations.

The Winter Triangle is shining in the night sky.