Alzheimer's disease & dementia

Important steps to prevent dementia

Alzheimer's disease wreaks emotional havoc on patients, who are robbed of their memories, their dignity, and their lives. It's financially devastating as well: care for Alzheimer's patients is predicted to top $1 trillion ...

Obstetrics & gynaecology

Mother or baby die in child birth every 11 seconds: UN

Global child and maternal deaths have fallen sharply in recent decades, but new UN statistics released Thursday show unequal progress, with more than five childbirths a minute ending in tragedy.

Pediatrics

Why fidgeting could be good for your child's health

Fidgeting is usually considered as a sign of boredom or lack of attention which can be distracting to others. Parents and teachers often demand that their children and pupils stop doing it. But fidgeting could actually be ...

Health

Share of uninsured Americans rises for 1st time in a decade

The proportion of Americans without health insurance edged up in 2018—the first evidence from the government that coverage gains under President Barack Obama's health care law might be eroding under President Donald Trump.

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Number

A number is a mathematical object used to count and measure. In mathematics, the definition of number has been extended over the years to include such numbers as zero, negative numbers, rational numbers, irrational numbers, and complex numbers.

Mathematical operations are certain procedures that take one or more numbers as input and produce a number as output. Unary operations take a single input number and produce a single output number. For example, the successor operation adds one to an integer, thus the successor of 4 is 5. Binary operations take two input numbers and produce a single output number. Examples of binary operations include addition, subtraction, multiplication, division, and exponentiation. The study of numerical operations is called arithmetic.

A notational symbol that represents a number is called a numeral. In addition to their use in counting and measuring, numerals are often used for labels (telephone numbers), for ordering (serial numbers), and for codes (e.g., ISBNs).

In common use, the word number can mean the abstract object, the symbol, or the word for the number.

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