Contactless, or “tap and go,” is an increasingly popular way to pay around the world. But in the U.S., only 3 percent of cards are contactless. Why?

In this Alux.com video we'll try to answer the following questions:

• Who is Elizabeth Holmes?!

• Who is Sean Quinn?!

• Who is Eike Batista?!

• Who is Bjorgolfur Gudmundsson?!

• Who is Allen Stanford?!

• Who is Bernie Madoff?!

• Who is Vijay Mallya?!

• Who is Adolf Merckle?!

• Who is Alberto Vilar?!

• Who is Manoj Bhargava?!

• Who is Olav Thon?!

• Who is Femi Otedola?!

• Who is Huang Wenji?!

• Who is Patricia Kluge?!

• Who is Ramesh Chandra?!

Smartphones may be our first introduction to 5G, but it's most significant impact may be felt in how it connects us to everything else. Tom Chitty reports from Mobile World Congress.

In an interview with CNBC's Becky Quick, Berkshire Hathaway's Chairman and CEO Warren Buffett says he would like to still be invested in Kraft Heinz five to ten years from now, though he thinks that 3G Captial misjudged how competition would evolve in the sector.

Founder, Chairman and Co-Chief Investment Officer of Bridgewater Associates Ray Dalio talks to Julia La Roche in 2018 of Yahoo Finance about the value of savings and investing.

Senators Elizabeth Warren and Bernie Sanders and freshman Representative Alexandria Ocasio-Cortez, have all proposed major tax increases on wealthy Americans. History shows that the United States has not only survived, but thrived when the rich had higher marginal tax rates. But how much would increasing rates actually raise, and what could it do to the economy? The real reason to tax might be to decrease inequality itself.

Amid a shaky marketplace, investors are eyeing the yield curve for signs of economic stability. History shows that when the yield curve inverts, a recession may soon follow.

China's economic growth is slowing down. But what's really going on in the world's second largest economy? In this video, Dharshini David takes a look at the figures behind the headlines for Reality Check.

There is a common misunderstanding about how tax brackets work in the US, and it’s causing us to have uninformed debates about taxes. In this video, Vox explains this misconception, where we’re going wrong, and how it actually works.

To solve the problem, he suggests shifting focus from providing student loans to increasing the supply of education options – including trade schools, online learning, and community colleges.

Chief economist of Moody's Analytics Mark Zandi says America's immigration policy under the Trump Administration conflicts with the country's core interests.

He says what has historically made America's economy "special" is that it attracts "the best and the brightest" from all over the world.

He also says baby boomers' retirement will make welcoming immigrants a necessity in order to help keep programs like Social Security and Medicare funded.

Billions of dollars flow into the U.S. from China every year. CNBC’s Uptin Saiidi explores some of China’s biggest assets in New York and explains how the trend is shifting.