Stocks: 4 things to know before the open

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Don't get your hopes up for a quick market rebound. Today is not the day.

Here are four things you need to know before the opening bell rings in New York:

1. Seeing red: U.S. stock futures are pushing lower Tuesday, a day after markets took a sharp fall.

On Monday, the Dow Jones industrial average plunged 331 points, while the S&P 500 fell 1.8% and the Nasdaq closed with a 1.6% loss.

Investors have grown increasingly concerned about falling oil prices and a souring global economy. Oil prices dipped below $50 a barrel Monday -- the first time they've hit that level since the Great Recession in April 2009.

Crude oil futures continue falling Tuesday, trading just below $49 per barrel.

The price of gold and U.S. Treasuries are rising -- both signs of investors feeling nervous. The yield on 10-year Treasuries dipped below 2%.

Related: Fear & Greed Index

2. International overview: All major European markets were in the red in early trading, with many indexes down by about 1%.

The latest gauge of European economic activity from Markit showed the region's services and manufacturing industries grew at a sluggish pace in December.

The euro is relatively steady against the U.S. dollar, trading near a nine-year low of $1.19.

Most Asian markets closed the session with big losses, taking their cue from the U.S. drop. The Nikkei in Japan led the decliners with a 3% loss.

Related: 3 reasons the euro has been plunging

3. Toyota shares technology: Toyota (TM) said it would share more than 5,000 fuel cell patents with competitors, in the hope of kick starting commercial production of hydrogen-powered cars.

The world's biggest carmaker made the announcement at the Consumer Electronics Show in Las Vegas.

4. Another Bitcoin hack: Europe's biggest Bitcoin exchange -- Bitstamp -- has been hacked.

The hackers made off with about 19,000 bitcoins ($5.2 million) from exchange accounts. The company has temporarily suspended its service.

The price of Bitcoin has fallen sharply over the past year as the hype around the alternative currency waned. The digital currency is now worth about $275 per coin.

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