Here's everything you need to know before Wednesday's opening bell:

  1. Walmart (WMT) plans to expand home delivery to more than 40% of U.S. households by end of year.
  2. Google (GOOGL) announced a ban of Bitcoin advertisements.
  3. Broadcom (AVGO)  formally abandoned its pursuit of Qualcomm (QCOM) .
  4. Stephen Hawking died at 76. 
  5. U.S. stock futures moved into the positive but remained on the edge.

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