Struggling to feel pleasure is a key marker of depression. But this distressing symptom can also occur on its own.

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

Natural selection uses duplicated genes as raw material for functional innovation, co-opting their existing features to new functions. Understanding genetic innovation requires two questions to be ...

Satisfaction gives us contentment. But if you can't quite get there, don't worry — it doesn't make you an ungrateful ...

Andriy Blokhin has 5+ years of professional experience in public accounting, personal investing, and as a senior auditor with Ernst & Young. Erika Rasure is globally-recognized as a leading consumer ...

The burden of cognitive decline is growing, affecting many people worldwide and placing a substantial strain on health-care ...

Organelles are entities within a eukaryotic cell that have a specialised function. Examples of organelles include the nucleus, the endoplasmic reticulum, the Golgi, mitochondria, vacuoles or lysosomes ...