Top 100 presentations

1. Continuous Verb Tenses
   35268
2. Support and transport in plants
   33760
3. Anyong Tubig Anyong Lupa sa Asya
   29266
4. Elements compounds and mixtures
   25948
5. Chromosome
   21919
6. Simple Verb Tenses
   20777
7. Atomic Structure
   20140
8. Balancing Chemical Equations. Balancing redox equations
   20083
9. Periodic Behavior
   19859
10. Newton’s laws of motion
    18804
11. Periodic Trends
    16724
12. Adverbs
    16626
13. Percent Composition, Empirical and Molecular Formulas
    15952
14. Animal Farm
    15745
15. Bonding, Molecular Shape & Structure
    14696
16. MakingFood
    13363
17. Circulation and Gas Exchange
    13359
18. DNA - An overview
    13002
19. Fungi
    12847
20. Atomic Structure and Periodic Trends
    12796
21. Volumetric
    12635
22. Feminism- Cure or Curse
    12527
23. Atomic Structure and Periodicity
    12453
24. Hormones and the Endocrine System
    12079
25. Animal Development
    11975
26. Derivation Applications of Bernoulli Principal
    11860
27. Osmoregulation and Excretion
    11404
28. Plasma Membrane-Gateway to the Cell
    10752
29. Plant Structure, Growth, and Development
    10653
30. Acid, bases and salts
    10198
31. Development
    10162
32. Mirrors and Lenses
    10089
33. Structure of the Atom
    9906
34. Balanced forces
    9876
35. Ancient Civilizations
    9786
36. Mass Spectrometry
    9738
37. Pronouns
    9717
38. Nouns
    9652
39. Resource Acquisition and Transport in Vascular Plants
    9434
40. Forests
    9364
41. Support and transport in plants
    9308
42. Atomic Structure
    9276
43. Cell Types and Cell Structure
    8971
44. Newton’s third law of motion
    8896
45. Animal Nutrition
    8656
46. Transplantation Immunology
    8591
47. Cellular respiration
    8485
48. Growing Plants
    8322
49. Sensory and Motor Mechanisms
    8282
50. Electrical Circuits
    8220
51. Plant Responses to Internal and External Signals
    8078
52. Lab Equipment
    8008
53. Prepositions
    7958
54. Viruses, Viroids, and Prions
    7860
55. Neurons, Synapses, and Signaling
    7828
56. Of Mice and Men
    7779
57. A Tour of the Cell
    7645
58. Basic Structure of a Cell
    7631
59. Real time PCR and it's functions in diagnosis
    7580
60. Covalent Bonding (Molecules)
    7566
61. Plant structure adaptations and responses
    7527
62. Ionic Bonding
    7430
63. Cellular Division
    7399
64. Mendelian Genetics
    7042
65. To Kill a Mockingbird
    7036
66. Blood Type Genetics
    6993
67. Satellite Orbits and Uses NIS
    6982
68. Molecules and Ions
    6896
69. Well logging The Bore Hole
    6871
70. Sound
    6818
71. The Immune System
    6787
72. Membrane Structure and Function
    6702
73. Animal Reproduction
    6671
74. The Chemistry of Acids and Bases
    6622
75. Angiosperm Reproduction and Biotechnology
    6609
76. Rocks
    6591
77. Plant Diversity
    6549
78. Mendel and the Gene Idea
    6498
79. Cell Communication
    6477
80. Balancing Chemical Equations
    6468
81. Rate Laws
    6341
82. Drama
    6305
83. Hybridization of Orbitals
    6286
84. Introduction to Oscillations and Simple Harmonic Motion
    6280
85. The Building Blocks of Matter Atoms
    6209
86. Empirical Formula
    6198
87. Electron Quantum Numbers
    6138
88. An Introduction to Metabolism
    6083
89. Translation. Protein from RNA
    6075
90. Neurons
    6012
91. The Structure and Function of Large Biological Molecules
    5908
92. The Mole
    5891
93. Cell Membrane + Tissues & Organs Definitions
    5856
94. Photosynthesis
    5851
95. Karyotypes
    5821
96. Earthquakes
    5817
97. ADP, ATP and Cellular Respiration
    5783
98. Endocrine System
    5745
99. Classical greek philosophy
    5653
100. Conjunction
     5612

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)